7Hz X Crinacle: Zero 2

Headphones and Coffee

Previously known as Wretched Stare
Same but better?
Pros: Not offensive safe tuning, colorful tips
Cons: Build is ugly and weird, cable is thin

Lets talk about the "improved" zero. The new Zero two comes in a simple box, inside is a new designed cable, its much thinner than the original the connector says salnotes while the little round logo on the splitter says 7hz, the two-pin connector has a weird bend to it but it doesn't hinder performance or comfort. It's the same look wise as the OG, the shape is an angled shape resembling a marshmallow peep to me. plastic is thick with a large seam being shown, look wise it's not impressive at all and ugly in my opinion. Still it seems to be made okay for the cost.

The lower end on the Zero2 is well emphasized with both the sub and mid being prominent. Bass is warm and thick with just okay speed and control. This is not the worst Bass, but it is not the best I've heard, and I honestly think while the quantity went up the quality went down. Bass is enjoyable for casual listening though.
The Midrange has decent weight and okay separation, surprisingly male vocals are just okay while female vocals sounded more energetic. Positioning of the vocals are good with female being more forward but not shouty at all.
The treble is more safely tuned and while it is enjoyable it could really use more energy.
The Soundstage is tight and while it has average imaging it can fall apart with busy recordings.

The ZERO2 is a pleasant and affordable Harman like tunning with nothing to boring and a safe tunning it is sure to be a hit with everyone but that said I'm not too impressed. I think it's good but I much rather like the EW400 better.


500+ Head-Fier
For $25 you can't go wrong!
Pros: + Price to performance
+ Solid tuning
+ Non-fatiguing - great for long sessions
+ Vocals
+ Fit and comfort
+ Lightweight
Cons: - Plastic
- Stock cable is bad
- Design may not appeal to everyone
- Soundstage a bit narrow (nitpick)
Thaslaya's ranking system:
☆☆☆☆☆ - Best in class/buy it now
☆☆☆☆ - Highly recommended
☆☆☆ - Sound for thee, not for me
☆☆ - Can't see the appeal
☆ - Product is a failure

This product was purchased by me and all opinions are my own.

Gear used:
●LG v30+
●Samsung Galaxy s22 Ultra
●Samsung dongle
●Hiby FC4

●Listening was done through Amazon Music HD or Ultra HD on an LGv30+. Iems were burned in for 30 hours prior to review.

●7hz x Crinacle Zero 2 features a single 10mm dynamic driver. Like the original Zero, the 2 is a collaboration with acclaimed YouTuber and founder of In-Ear Fidelity, Crinacle. They are currently priced on Linsoul's site for $24.99 and are offered in 3 color variations.

Build, fit, ergonomics:
●The Zero 2 are mostly built from plastic. The build quality leaves a bit to be desired but considering the price it's understandable. The nozzle is on the shorter side which could mean fit issues for some that prefer a deeper insertion. I was able to obtain a good seal and fit with the included multicolored tips with no discomfort over long listening sessions. The included cable is touted as an upgrade over the original by 7Hz but I personally don't care for it at all. I substituted for a Xinhs gold cable.

Sound impressions:
●Technicalities and resolution take a hit but that's expected at this price point. The soundstage seems a bit narrow but overall satisfactory.

●Lows - Right off the bat I can tell the Zero 2 have a slight bass elevation. Sub bass can dig deep when pushed and mid bass slam is present without taking much away from other frequencies. The quality isn't the best and sometimes gets a bit bloated on certain tracks.

●Mid - To my ear, this is where the Zero 2 excels and gets things just right. Both female and male vocals sound great and are pushed forward slightly. The weight and texture are nice and there's no shoutiness.

●Highs - Treble is rolled off. I would have liked a bit more air and extension. On some tracks I detected a tiny bit of sibilance in S's, T's, and cymbals.

Switching over to the Hiby FC4 and Pac480 4.4mm cable, the soundstage seemed to open up a bit more. Note weight gets a bit of a bump across the spectrum and the bass digs a little deeper. The Zero 2 seem to come more alive and i can hear more of an energy across all frequencies. There is definitely good scaling with power but with that comes an added energy that may be fatiguing over long listening sessions.

●Sample Tracks
Below are a few songs I used to form my impressions. Let's break down a few.

"Begin Again" - Taylor Swift (Taylor's Version) - Taylor's voice has a bit of warmth and sounds great. The bass hits at the 0:31 mark and has a nice deep extension. Mid bass slam adds a nice weight without bleeding over into the mids. I do wish the soundstage was a bit wider and the treble extension went further to add more air.

"Sign of the Times" - Harry Styles - Harry's voice sounds perfectly placed at the beginning of the track. At the 1:21 mark the rest of the instruments hit and the whole spectrum gets more balanced with vocals taking a slight step back. Mid bass texture suffers on this track and sounds a bit bloated and boomy.

"Half of My Heart" - John Mayer - In the intro the guitar strumming timbre seems a bit off and metallic. John's voice is well placed at the front and has good timbre and weight. The elevated bass bleeds a little into the mids on this track.

"Save Your Tears" - The Weeknd - A nice intro with snare hits that don't have a hint of piercing quality. Sub bass hits well and deep at the 0:10 mark. The Weeknd's voice has good timbre and weight and seems to be well balanced. The highs have a bit of muted quality due to the treble roll off.

"I Hope You're Happy Now" - Carly Pearce & Lee Brice - A nice hitting bass right at the start does a good job of staying in its lane. Carly's voice has good timbre and weight. It is more forward throughout the song whereas Lee's sounds more balanced. A little more treble would help here to even out the spectrum.

The Zero 2 has carved out a space for itself in the very crowded ultra budget tier. At only $24.99, it is a competent iem and a fairly solid all-rounder. It excels with more intimate, vocal heavy music but starts to struggle on complicated tracks. If you're looking for a slightly bass elevated, warm tuning with forward vocals, rolled off treble, and you have $25 burning a hole in your pocket then definitely give the Zero 2 some consideration.


  • 1000015874.jpg
    1.1 MB · Views: 0
  • 1000015946.jpg
    1.1 MB · Views: 0
Last edited:

Micro Audio Review

New Head-Fier
Cheap but not Compromised!-Saltnotes Zero:2
Pros: Natural tuning
Superb Female vocal
Cost to price ratio
Comfortable to wear even for a long period
Nice imaging and detail retrival
Cons: Slightly Elevated bass
Soft treble
Polarizing Outlook
Today, we are going to review the saltnotes Zero:2,which is the second generation of the Crinacle collab with Saltnotes at the ultra affordable sector. Its UK price is £25 .


The Zero:2 comes with a great 3.5mm cable.It do not retain memory or tangle for no reason.
It also comes with a generous amount of tips which is sonically perfect and with plenty sizes to choose from.

Zero:2 is a 1 DD iem with swappable cable.Its 2 pin socket on the iem seems very durable and solid.
The shell is transparent and is decorated with a pulled metal front plate, which makes it stylish and nice to look at.

If you are pairing it with a phone (in my case S22 Ultra) like me, you might need a portable dac or amp to go with it. Although the sound quality is the same,the sound is just not loud enough for me.
But if you are pairing it with other source like a PC or laptop,it should be fine.

The mid-bass and sub-bass is slightly elevated than I would have expected. It is more pronounced in most of the songs than I would have expected, but would not affect my rating towards it. However,I feel the bass has a slightly loose nature to it, it is slightly blunted and slow, I think it might have to do with the drivers in the zero:2.
Fine performance in the bass for the price given.(4/10)

Disclaimer:I do not listen to male vocals a lot, so take this rating with a grain of salt.

For male vocals,they sound good,but lacked the texture, body and details to make them superb.However, the male vocal's emotions and tuning is fine, so I would give it a passing grade.(5/10)

Female vocal is very good on the Zero:2. The female vocal is properly placed, not too forward nor laidback, it is clean, full-bodied, energetic and emotional. To me, the only problem that I can think of, is its details can be better on the female vocal. Do not get me wrong, the details are good enough, but not enough to support such an impressive expression of female vocal.(6.5/10)

Any other instruments that lives in the midrange like violin, flutes are slightly emphasised, they are clean, real but nothing really special to talk about.(5.5/10)



For me, the treble is a bit soft. I think that the treble and air frequency are not extended enough and their presence and emphasis is not enough. It makes the iem to sound less sharp and might have made the soundstage smaller as a result as well,but I am not a really big fan of the treble, makes song less enjoyable overall.(4/10)

I would say that the resolution of this iem is quite good for me, many details are present in this iem throughout my listen,but the problem will be they are slightly blurry and not sharp enough to make you notice them.
The imaging is actually so real to life and is so impressive as well that it sort of competes with my other much more expensivce iems, very impressive work.
The soundstage is where it falls short a bit, it is very crowded and tight. It is a bit below average, normal for this price range.

vs SE215
Zero:2 Blows the se215 out of the water in every possible aspects. The se215 has a muddy bloated bass,the missing midrange,non exsistence treble and absolute blanked out details and the much higher price tag.It is genuinely a massacre in every possible aspect and marks the Zero:2 as the easy winner.

Although I have noted out a lot of problems of the Zero:2, But I actually love it as an overall package, i am sure under $100, there will be no any other competitors even close to it.This slightly warm tilted, detailed iem has all the respect I can give it with its measly £25 price tag.

I hope this review is good enough for you guys to enjoy,I am now working on the youtube channel as seen above, I still have my Moondrop Variations, Sony IER-Z1R, HIFIMAN Ananda and a few more reviews waiting to be dropped.Please subscribe and comment on things that I can improve on, hope that you guys liked this!

Video Review Below:frowning2:Please watch and comment on places that needed improvements, subscribes is also appreciated! I have a few iem ,headphones ,dacs and dap review scheduling to be uploaded. Thank you!)


1000+ Head-Fier
Music for the Masses
Pros: Smooth, fun, all-round profile that can delight the masses.
- Musical, organic, full, rich, dense, clear and quite detailed sound for its price range.
- Exceptional value for money.
Cons: Treble may be too soft for some.
- The cable is a bit rigid and tends to get stiff.
- While the design may be pleasing and attractive to many, it has a certain toy-like appearance.

The already famous 7Hz brand is once again launching a new collaboration with the famous In-Ear Fidelity founder and YouTuber, Crinacle. Of course, it's the new 7Hz x Crinacle Zero: 2. This new model features a 10mm dual-cavity dynamic driver with a PU+Metal composite diaphragm. The result has been an improvement in bass and midrange, as well as faster diaphragm movement, giving a clearer, more accurate and punchier sound. The standard cable has also been improved by using a high-purity, silver-plated, oxygen-free copper conductor. Arranged in a coaxial structure, each wire is interwoven with 140.06 and 250.06 windings to strengthen the cable and provide better audio transmission. In this new version, the profile has been subtly changed, adding an additional 3dB in the low frequencies to gain presence in the lower range, offering a more attractive sound compared to the first version. With this, it gains in warmth, body and texture, generating more physicality and base in the fundamental frequencies, as well as avoiding bass bleed. Let's see how much of this is true in the following review.

7Hz x Crinacle Zero 2 01_r.jpg7Hz x Crinacle Zero 2 02_r.jpg


  • Driver Type: 10mm dual-cavity dynamic, with PU+Metal composite diaphragm.
  • Frequency Response: 10Hz-20kHz.
  • Sensitivity: 108dB/V@1kHz.
  • Impedance: 32Ω.
  • THD: <1%/1kHz.
  • Jack Connector: SE 3.5mm gold-plated.
  • Capsule Connection Type: 2Pin 0.78mm.

7Hz x Crinacle Zero 2 03_r.jpg7Hz x Crinacle Zero 2 04_r.jpg


The 7Hz x Crinacle Zero: 2 comes in a small white box with dimensions 105x75x34mm. On the front side you can see a realistic photo of both capsules without cable. At the top you can read the model name ZERO:2 in large letters. To the right is the Crinacle logo next to the logo of the brand itself. Underneath is a short description of the model and in the lower left corner the Salnotes logo. Many elements are repeated on the back, only the photo of the capsules is smaller and underneath are the product specifications, in Chinese. At the bottom are the brand details. When the cardboard is removed, the capsules are shown in a foam mould with a cardboard decorated in almost the same way as the box. It is protected by a transparent plastic sheet that acts as a lid. Underneath this layer there is a bag containing the cable and a bag containing the silicone tips. In summary, the complete contents are as follows:

  • The two 7Hz x Crinacle Zero: 2 capsules.
  • One cable with SE 3.5mm plug and 2Pin 0.78mm interface.
  • Three pairs of spherical silicone tips, sizes SxMxL.
  • Three pairs of narrow silicone tips, sizes SxMxL.
  • One instruction manual.

For a price of $25 you can't ask for much more. According to the brand itself, the cable and the driver have been improved. There is no bag or case to store the headphones. However, there are two types of colourful tips, the size differences of which are not very obvious.
The Zero:2 is available in three colours: Silver, Orange and Blue.

7Hz x Crinacle Zero 2 05_r.jpg7Hz x Crinacle Zero 2 06_r.jpg

Construction and Design

7Hz repeats the shape and construction of its first Zero model. This time, however, there are fewer colours to choose from and the casing is transparent. It still retains the triangular stepped shape reminiscent of a transformer. Also the external metal plate on which the model name is displayed. The Silver version has a metallic plate in the same colour and the capsule is transparent. This is the model I am describing. The Orange version has a dark outer plate of the same colour and a dark body. Finally, the Blue model has the body in that colour. It is clear that this model has a rather peculiar shape, with the thin metal outer plate, with the letters of the model in white and a kind of pin embedded in the top corner. The capsules are made of transparent plastic, with a rather rounded shape on the inside. They allow the entire inside of the headphones to be seen, with the dynamic driver located close to the nozzles. There is a separate hole in the centre of the driver, further away from the nozzles. The entire inner face is formed from a single piece. There is a shallow letter inside a circle to indicate the channel. The nozzles are not very long, although they have an appropriate taper. They have the classic shape of two steps on a base of larger diameter. The narrow diameter is 5.4 mm and the crown is 6 mm. Their bore is protected by a metal spiral grille with a large hole in the centre. Underneath is a white filter that looks like a textile. The 2Pin 0.78mm interface is located at the edge of the capsule, fully integrated with it. The gold-plated connections are located inside a black plastic cylinder. A red dot indicates the polarity of the connection.
The cable consists of two joined strands coated with dark translucent PVC. The plug sleeve is a black, metallic cylinder with a micro roughened surface. Salnotes can be read longitudinally. The splitter is a kind of biscuit with a plastic border to match the cable, the faces of which are two mirror plates. On one is the brand logo and on the other is the model name, although the model name is barely legible. The pin is a custom-made piece in the shape of a ring, the inside of which is just the right size for the two cables joined together. It slides correctly and performs its function well. The cable has over-ear guides, but they are relatively soft and not too stiff. The sleeve of the 2Pin 0.78mm connectors has a slight curvature and its diameter grows subtly towards the connectors to end in a circular black plastic base on which protrude rectangles containing the two gold-plated pins. Each sleeve has its lettering to indicate the channel, embossed on the surface.
As a whole, the capsules are very light, and still look more like a toy than an IEMS. But I can't say that the construction is bad, as the capsules are sturdier than they look.
The cable is somewhat stiff, though it is soft and seems sturdy. The channel lettering on both the capsules and the cable is not very noticeable.
What more could you ask for at this price? In terms of build quality and capsule design, there is a noticeable element of differentiation from other models. It is clear that its appearance is the most controversial point, but both the shape and the weight help a lot in the following section.

7Hz x Crinacle Zero 2 07_r.jpg7Hz x Crinacle Zero 2 08_r.jpg

Adjustment and Ergonomics

As I said before, the appearance can be a bit of a criticism, it looks like a fragile toy. But its very light weight and shape fits perfectly in my ears. The nozzles are not very long, maybe they are the weak point and the insertion is only superficial. Depending on each morphology, this can be a good thing or, on the contrary, it can be a problem that prevents a correct seal. In my case, with the large foam-filled home-made tips, the fit is very occlusive and the capsules are completely integrated in my ear. Even so, I find that the mouthpieces are a bit short, as the inner side is in contact with the parts of my ears, something that, in the long run, can cause some discomfort due to the pressure exerted. Despite this, the angle of the nozzles is adequate and adapts correctly to my ear canal. The fit is immediate and there is no movement of the capsules. This adjustment allows intensive daily use, it is suitable for sports and if, as the hours go by, the rubbing I mentioned earlier does not prevent it.
With so much contact and thanks to the size of the tips I use, the isolation is quite high.

7Hz x Crinacle Zero 2 09_r.jpg7Hz x Crinacle Zero 2 10_r.jpg



It is curious that the frequency response is much more in line with Bad Guy's target than Crinacle's. It even has more sub-bass than the one proposed by Bad Guy. In my opinion, the Zero 2s have a W-profile with an emphasis on sub-bass, rounded midrange and mid-treble. The midranges are not too sunken, as I say, the pinna gain is rounded and not excessive, while the treble starts with a controlled roll-off, to rise slightly later on. Overall, there is a more powerful low end that is intended to win over those who found the first Zero thin and lean in the lower range. The transition between high-mids and early treble has also been smoothed, perhaps slightly too much so. As a result, the current sound is warmer, with a more physical base, softer treble and a more limited, subtle brightness.

7Hz x Crinacle Zero 2.png


It's important to put the sound of the 7Hz x Crinacle Zero 2 in perspective, knowing that they cost €27. And it's not just because they sound good, but also because of their behaviour and level of bass performance. Without having been able to enjoy the first version, I like their tuning and I'm glad that the Zero 2s move away from Crinacle's preferred profile. I must comment that, in general, it is not my preferred curve either (I am still shaping it...), but it is true that I prefer them as IEMS in this price range, whose use can be very all-round, daily or battle. In this sense, the sub-bass is the star and the mid-bass feels a bit bloated. Still, it saves power and the whole low end, has a remarkable presence, occupies very good volume and is fun, without reaching Bass-Head territory. It is true that its texture level is low because its development is much smoother. However, it has a good level of elasticity, without being too rubbery because it is quite compact for what it costs. It dissipates quickly, recovers quickly and has a remarkable level of dryness. It is in these aspects that the Zero 2 stands out, this behaviour is very admirable for its price. And this is confirmed in the pure tone test. The 20Hz LFO reproduction is very pleasing and enjoyable, the tone is very realistic, deep, with a good physical and sensory blend. I've seen much worse performances in $100+ IEMS. The Zero 2's execute pure very low frequency tones naturally, there is almost no colouration, giving a punchy, punchy impression, as well as holding quite a bit of power without suffering. In this aspect, the Zero 2 are not intimidated by their small size and are ready to support a good volume of the connected source without complaining or suffering. This excellent behaviour, translated to real music, means remarkable performance. It may not have the level of resolution to discern all the detail, layer all the layers or accurately describe the most complex bass lines. But it can boast great performance for a ridiculously low price. Limitations also exist and these are concentrated in the fact that its technical ability is restricted, I would rather say simplified. In complex passages the Zero 2 doesn't suffer at all, but it doesn't show a fully reliable descriptive ability either, as it suffers from a certain level of resolution that prevents it from following bass lines in detail. It's not fast enough to reach those analytical levels, but its representation is very convincing and, most importantly, flawless. The result is powerful, punchy, powerful, fairly clean, realistic, natural, with plenty of oomph, compact and smooth bass, which you can't ask for anything at this price.

7Hz x Crinacle Zero 2 11_r.jpg7Hz x Crinacle Zero 2 12_r.jpg


Once again, the Zero 2 have surprised me in a very pleasant way in the midrange performance. During my first listens I had detected a simplistic execution of the central range, without too much level of resolution. I had perceived a midrange descriptive behaviour, without too much detail. But with more selective, careful and critical listening, I have realised the great level of detail they offer for their price. First of all, the Zero 2 is not opaque at all, it has a remarkable level of separation and is capable of describing micro details in a partial way. While it is true that it is not able to develop them fully, they can be intuited in the midrange. And this is something I didn't expect at all. It is worth noting that it does not have an analytical sound, on the contrary, its representation is smooth, as is clear from its rounded curve of midrange and slightly sunken first treble. With this fairly controlled level of brightness, the notes do not appear too thin and it is easy to detect a certain thickness in the music. However, the sound is far from being homogeneous, congested or continuous. There is more than enough technical ability to demonstrate good clarity, in a profile with a warm tendency, where the bass has a notable prominence. And, in this case, that is not achieved by energising the midrange, nor by saturating the treble. Quite the opposite, as I have already mentioned. In this scenario, achieving this level of clarity, precision and detail is only possible by creating a dynamic driver that is sufficiently resolute to offer all these sensations. And here I come back to the price, which is $25. The Zero 2s have managed to recreate a sufficiently rich sound without falling into the facile trap of advantageous tuning in that regard. And this is something that is normally reserved for much higher priced IEMS.
Returning to a more traditional description of the midrange, the first half is slightly sunken. The male voices are presented at a midrange level, though clean. The physicality of their body is relatively low and they are somewhat lean. They don't show exuberance or too much complexity. But they are still able to deliver a certain level of punch at their base. Again, texture is not its strong suit, nor is the level of nuance, due to its smoothness. Despite this, this first half proves to be quite transparent within an inoffensive and gentle profile. In the second half there is a clear excitement, which is very much controlled by the midrange limiting of the first treble. In this way, the female voices are neither shrill nor completely dominant. In addition, the overall timbre is somewhat dry, relatively analogue, but never brilliant, on the strict and restrained side of its harmonic extension, but quite natural after all. The result is a balance that is more obvious than one might expect looking at the chart. There is a good projection of the details and nuances of this second part, but without being explicit or splashy, keeping a very appropriate level of blending, both with the vocals and the instruments, so that there is no predominance of one or the other. In this way, the aforementioned balance is maintained, as well as a sense of cleanliness, transparency and separation, without there being a clear predominance of any of these characteristics. None stands out clearly over the others and I think that the good synergy between them helps to enhance the visibility of the midrange in a quite realistic way.

7Hz x Crinacle Zero 2 13_r.jpg7Hz x Crinacle Zero 2 14_r.jpg


The entry into the high zone is inverted, generating a slight drop that turns into the classic sibilance and brightness control phase. It continues to subtly recover and persist until the air zone. In this sense, for a dynamic driver of this price, the extension is quite good, although the treble presence is subtly nuanced in the initial phase. The result is a controlled initial sparkle but with good extension in the mid-treble. In this way, the harmonic register is enriched and the sound is dynamised so that it is not completely smooth, but with a slightly displaced, but still controlled brightness, so as not to lose balance.

7Hz x Crinacle Zero 2 15_r.jpg7Hz x Crinacle Zero 2 16_r.jpg

Soundstage, Separation

Perhaps the Achilles heel of the low-budget IEMS is the stage and separation. In this respect, I am very satisfied with both features with these Zero 2s. Again, knowing how to relativise their outstanding price/performance ratio, the soundstage is quite spacious as it doesn't sound congested, concrete or intimate. There is a good level of laterality, although the exposure is clearly frontal, with an average height and a good level of depth. The level of detail is not quite micro, but there is enough subtle capacity to sense an initial development. In this respect, there is also good layering of sound and nuance, which helps to recreate those midrange details. Separation is obvious, achieving a good level of clarity and transparency. It will never show an analytical character, but it has the virtue of sounding smooth, balanced, powerful in its low end and rather more resolving than the price, profile and frequency response might lead one to believe.
The positioning and imaging is more than adequate, without too much more to comment on.

7Hz x Crinacle Zero 2 17_r.jpg7Hz x Crinacle Zero 2 18_r.jpg


Kiwi Ears Dolce

In the same price range are the Kiwi Ears Dolce. They have a similar level of construction, with a transparent inner housing and an opaque outer plate in both cases. The clear difference is in the trapezoidal look of the Zero 2, with a semi-custom shaped capsule of a very restrained size in the Dolce. The Kiwi's look is more mature and neutral, while the 7Hz's "transformer" design gives them a more toy-like appearance. Ergonomically, the Zero 2 has shorter mouthpieces and a rim geometry that can be uncomfortable due to direct contact with the apexes. The longer nozzles and much more rounded shape give the Dolce a higher level of comfort.
The Dolce's cable is thicker and perhaps less stiff, although both seem to be prone to shape.
Los Kiwi vienen con lo mínimo, mientras que los 7Hz ofrecen un segundo juego de tips de silicona.
In terms of profile, the Dolce offers a more polarised mid-high profile, with a greater imbalance between the upper midrange and the upper end. They also have a slightly more bloated low-midrange and less sub-bass.
Right off the bat, the Zero 2s offer a more balanced and fuller sound across the entire range. Starting with male vocals, the difference in presence is clearly higher in the 7Hz range. The Kiwi's, on the other hand, have a distinctly sunken sound, as well as a certain hollowness in the midrange.
The Zero 2's bass is richer and fuller, with a more pronounced sensory capability, more power and volume, and better texture. The Dolce's bass is leaner and more subtle. Behaviour is more realistic and natural at 7Hz. There is a clear difference in the overall tone of the two low end, with the Kiwi's sounding slightly duller and darker.
While the high-mids are more present in the Dolce, something that enhances the presence of female vocals, as well as providing a more forced clarity and a more splashy sound, the details feel pushed, albeit less natural. There is an imbalance between the profile of the two IEMS, with the Zero 2s benefiting. The 7Hz are more homogeneous, fuller, richer, denser and plusher. The Dolce are more polarised and there is more presential distance between the elements. Meanwhile, the Zero 2 are better harmonised and show no hollowness in the sound, being more musical and natural.
The Dolce's treble is clearly crisper than the 7Hz, which feels more controlled and nuanced. There is a more obvious brightness in the Kiwi's although they also possess a clear control zone, but their greater presence in the midrange and longer extension into the air zone provides greater exposure and predominance of the high notes in the Dolce.
At the scene level, the Zero 2 is closer, but also fuller and wider. With no gaps and more fullness, they present a denser, more filled, but also more extended soundstage. There is good depth in the Kiwi, but the Zero 2s have a little more transparency and separation, a more defined and resolving sound, with no hint of darkness or veil, something that is a little more present in the Dolce.
In my opinion, the 7Hz x Crinacle Zero 2s are a step ahead of the Kiwi Ears Dolce musically, offering a more mature, fuller, balanced and homogeneous sound, with a more all-round profile, achieving better separation, transparency, resolution and detail. It's also worth noting, though, that they are softer and more muted in the treble.

7Hz x Crinacle Zero 2 vs Kiwi Ears Dolce.png


The 7Hz x Crinacle Zero 2 would be the first IEMS I would recommend to those who want to get started in this world, but without spending much money. They are the gateway to something bigger. With a very solid base, quite comfortable, with a very low weight, with very well executed and resolved bass, with a quite full and complex midrange and a moderately extended, but soft treble, the Zero 2 are in my top of very low budget models. To say otherwise would be to say too much.

7Hz x Crinacle Zero 2 19_r.jpg7Hz x Crinacle Zero 2 20_r.jpg

Sources Used During the Analysis

  • Aune Yuki.
  • Tempotec MARCH III.
  • Hidizs AP80 PRO-X Red Copper LE
  • Hidizs S9 Pro Plus.

7Hz x Crinacle Zero 2 21_r.jpg7Hz x Crinacle Zero 2 22_r.jpg

Linsoul Audio Store, offered me this model, in exchange for writing an honest review. I want to make it clear that all my opinions written in this review have not been conditioned by this fact, nor will I ever write anything that I do not really think or feel here. I will only write about my personal opinion in relation to the revised product.

7Hz x Crinacle Zero 2 23_r.jpg

Purchase Link
7Hz x Crinacle Zero 2 24_r.jpg

You can read the full review in Spanish here
7Hz x Crinacle Zero 2 25_r.jpg


Headphoneus Supremus
Pros: Amazing vocals
Authoritive bass
A great midrange while still presenting the soundstage and imaging the original Zero was known for
Cheap price
Great quality control
Even, complete and correct frequency response
Super well rounded playing all genres and from all sources
Cons: Hmmm?
The 7Hz Salnotes X Crinacle Zero 2



Zero MK2
Many of you have maybe heard the name Zero before for an IEM. In fact Crinacle did the original tuning for the Zero MK1, but didn’t get credit for it till later on. It was the Truthear Zero which he proudly posted his name onto, as he felt it was a conflict of interest to have 2 Zero collaborations at the same time. Yep, both 7Hz and Truthhear had a boner for the word “Zero”. But the other reason you may have heard the word Zero is because (the original Zero) is possibly one of the best selling budget IEMs to ever hit the market…….ever?

At the original retail price of $19.99 the Zero was everyone's dream concept of an entry level IEM. The first review I wrote was just the beginning, as more reviews were to follow both on Head-Fi and the IEM community at large. Here we are at almost 60,000 page views, which is saying a lot for this little clump of plastic, some metal and some wires.

Now it must be disclosed that my views here may be slightly skewed as I’m an intensely emotional fan of the original Zero. Why? Well, it had a big stage and great imaging, offered note weight and was only $19.99. Oh, and correct timbre, timbre is also well done, and that is saying a lot for an IEM the price of two sandwiches with your gal.

Now while not perfect, the original Zero somehow connected me to music…….in a way that I have always tried to explain, but have mostly failed. The Zero in my eyes was an IEM for the masses. An IEM that was low-cost yet provided an audiophile experience. I have been guilty of continuing to reintroduce the Zero as a contender to almost countless side-by-side battles, and almost all the time the Zero won. So you can imagine that when I heard they were making a new Zero I was surprised.

The old original Zero was not perfect, and you know how everyone talks about what they like and don’t like on-line. What a perfect way for Crinacle to do market research and reintroduce a new Zero for the world to hear. Adding bass frequencies, and toning down that original 12kHz treble peak. Yet also lowering a slight peak at 3.2kHz to 7kHz to simply smooth out and homogenize the whole party..........to (if I can say) commercialize the tuning and add more thump. :)

The original Zero MK1


Should I buy the original or this new one?
With this question I will try to show a few reasons why one would be better than the other. That’s right, a Zero MK1 v MK2 side-by-side.


Both MK2 and MK1 are listed with the same specifications:
  • Driver: 10mm dynamic driver
  • Frequency response range: 10HZ-20KHz
  • Impedance: 32 ohms
  • Total Harmonic Distortion (THD): <1% at 1KHz
  • Plug Type: Detachable 0.78mm 2Pin
But of course we know they are tuned differently. Yet I liked the original MK1 cable more? Also sorry for not getting (a better) glamour shot of this new MK2 included cable? Yet really it is fine, the included cable is fine for what it is, of course I played with other cables too. But if anything this new cable is possibly a downgrade, I mean times are changing and it has been a while since early August 2022 when the original Zero came out. Maybe they had to cheapen the cable up a tad? So what, most of us have more cables to use, plus we are going to need a different cable to join (the Zero 2) with our 4.4mm amp of our DAP. Most every DAP now has both 3.5mm and 4.4mm plugs.

Zero MK1 Cable:

Zero MK2 Cable:


MK1 v MK2:
Using the ISN G4 cable in 4.4mm with the original WM1A with MrWalkman’s firmware, tips are my standard wide-bores. I find the original Zero to still hold charm. What is happening is drums have both timbre and note-weight. Though while the midrange is expressing this glorious positioning of elements, there is a slight lack of bass (with the Zero MK1) which is taking the midrange and vocals inside that mid-range, and adding focus to them. You see graphically it is not readily apparent that this lack of bass promotes such an increase in mid-centeredness, but of course it is there. Such a tune actually promotes vocals, and while there are more vocal centric IEMs out there, this MK1 is in-a-way the cheap way to get into great vocals.

Now while the original Zero is not everything, it has this big spacious positioning of elements where we find ourselves right in the middle of great entertainment, despite the fact that Rock shows a thinness that could almost be a sin? Yep, we have lost the gyrating and primal force associated with dancing almost……as it has been neutered. While the bass is still present, there truly is a lack of low-end which almost could be a matter of taste if you truly loved the Zero MK1 or not? Then there is the treble energy, that may be also a choice where to some it's too strong, though I have never had a problem with it?


Switching over to the MK2 there is a grand bass authority now, such a deep presence, such a spectacle seems to add note-weight and reverberations of all events…….even though I want to continue to love my first girlfriend. I have to say both this MK2 drop in the 3.2kHz to 7kHz zone combined with the one-two whammy of more bass, truly change the overall stature.

We now have repositioning to a more commercial friendly and very different sound. Maybe a better MK2 sound, as we still have those giant midrange images going out to the side. Over-all it is not as shrill. Simply better balanced, and that is hard to write, because I truly like the lame duck off-balance of the original Zero……..and I wanted to write that this new tune is boring, but it is not. :)

DSC_1265.jpegw copy.jpeg

Here we will take on the Kiwi ears Forteza and Kiwi ears Melody. Laughably both are way more money with the Forteza being a 2DD x 1BA at $59.00, and the $89.00 and a pure single 12mm Planar IEM.

Kiwi ears Forteza:
I have been doing this for days, and this single comparison means a lot to me, truly I like the Zero 2 better. Now this is the hard part, as the Forteza stage is bigger, those 10mm bass and 10mm midrange DDs do a number to cement-in a provocative sound, only there is a tinge in the upper midrange that only makes the Forteza great with some music. It is this thinness that the Forteza tune is not as well rounded and doesn’t play all forms of music like the Zero 2 does. Now truthfully the Forteza has a bigger stage, and in some ways better technicalities, but falls short in certain bright vocal genres, where the Zero 2 is not totally exactly vocal centric (but the Zero 2 is vocal centric in a way) and it still has a smoother and correct, more correct way of doing vocals.

The Kiwi ears Melody:
It’s not that you have to have a love for Planar IEMs to love the Melody’s output. Truly this battle should not have taken place……what was I thinking when I put these two together? I was not thinking that’s true! Bigger..........everything is bigger with the Melody, bigger imaging and a crystal clear separation, showing us simply better technicalities can be found for $64.01 more. Though I will say the Zero 2 has better timbre. So that ends a give and a take here, that even though bass texture, staging and imaging is better with the Melody…there is a way the Zero 2 somehow holds this golden tone? Now ask me which I want to take on a trip for a few days……and I can’t decide….really……probably both?


Music tests:

Dead Can Dance
44.1 kHz - 24 bit

This ends a really important song as I use to judge drum texture........positioning and detail. Obviously this song's tone is a night and day difference from the original Zero. Reason being these drums have authority and all their stature into the stage, and thus remember that they almost came out midrange positioned with the Zero MK1.

The Zero MK1 was missing some of that drum density that is so important for realistic drums, yet it was still charming, ridiculously charming for a lesser amount of drum authority in playback?

And such drums have a way about them that they can sound remarkable on any style of playback, yet this time we are reminded of all that is there now. This deepness is correct sounding, and not interfering with the rest of playback. Deep round and big, at 00:15 there is a correctness to the cymbal that is uncanny……this cymbal sounds to be exactly as it should holding decays and timbre……exactly right. At 00:28 even though way more complexity has been introduced we are still holding our head above water. I’m simply waiting for things to get jumbled-up, it may happen, it may not? At 00:33 there are variations of intensity and detail in the cymbal strike that are charming and full in relief among the instruments? Wow? The deepness of bass drum at 00:36 calls for respect and nothing like what you would expect from taking the Zero 2 out of the box……..call me humbled?

Finally at 00:37 a sting instrument makes its presence known. TheTurkish Saz Baglama Cogur or Greek Pegasus Trichordo Bouzouki played by Brendan Perry make their way in. Such world string instruments offer both a fresh fascination to the modern guitar sound as well as exotic harmonics that you understand, but are not familiar with. Of course unless you’re a Turkish or Greek and a fan of traditional music you probably don't know them. Yet you also never heard the digital reverberations applied to such treasures, making this whole piece become otherworldly and an escape. One of our keys here is the correct note-weight, yet there is more……at 01:14 our star of the show makes her entrance. Lisa Gerrard now one-of-a-kind showcasing our fully vibrant vocals. And that is really the thing here……the fact that the Zero 2 plays all foams of music, plays them well from all sources, but obviously better from a DAP, and really does vocals well. All I can say is that I didn’t ever believe this new tune would have the vocals be just so good, so rich and full, holding that magic that we come to IEMs for in the first place!

cover_copy copy.png

Shield Emitter (feat. Tineidae)
44.1 kHz - 24 bit

One of the best bass songs, yet not just bass but bass layers, meaning there are stratifications of details within the bass. There is also a theme to the song: a soaring synth that is a lot like the opening for Blade Runner. Obviously this is not the best I have ever heard this song played, yet there is a cool deep bass positioning way out to both sides, and that song has a tallness to it, as already mentioned a wideness to it and even a front to back. It is this fishbowl effect that is a big part of the imaging, and midrange playback with the original Zero was found here as well……..it is part of the Zero IEMs DNA. But beyond that there are layers of midrange besides the bass that are emitted from the middle, and are in no way affected by the other sounds going on. In fact at 02:41 there is a let-up of extra instruments to where we are at one again with this bass, and even though there are other sounds present, there is a quietness. In this area the bass is either louder or just left to be heard singularly…..probably louder. There are ambient high pitched sounds falling off to the right and left that almost sound like water, yet electrified. At 04:18 I hear wind blowing, this sound of wind may be sooner, but that is how this music is that your perception all-of-a-sudden picks stuff out. As going back to the start again the bass almost sounds the same level. Yet in many ways this is the perfect song to test the Zero 2 with, as it is challenging the separation and rewarding the listener with big playback. At 01:30 there is a climax almost where a new synth takes over taking center stage, with what sounds like clocks ticking out to the side, yet clothed in echo. I hear air sounds and they are separated nicely…………really the Zero 2’s main accomplishment was to keep the mood here as well as sonic immersion.

Note how the Zero 2 has a wide assortment of colored ear-tips. Also it is safely put away in a protective box. There are one set of red ear-tips already on the IEM in the box.






Some folks have issues with the shape. I never did as the zig-zag shape is really only on the outside. Though I really do think this shape is pure marketing as you can identify the Zero 2 from 6 feet away. One neat thing is how the 2Pins are slanted inward. There is a metal faceplate that shows this product is different. But probably after all this time it is the length and angle of the nozzles that seem to work so well for me…….that and the Zero 2 is only 4 grams a piece in weight. Interesting too is with these see-through nozzles we once more find 7Hz up to their regular 3 level filter system. One black foam, two what looks like a sticker of white material, and three the actual one-piece screen made with cut-outs. Yet I have to say the Zero 2 nozzles have a better construction in layering of these materials, in comparison to the 7Hz Sonus which had small spikes which a cleaning cloth could grab hold of. Here is possibly a better way to do it, same outside screen as the Zero MK1. Also it should be noted that the MK1/MK2 form factor and size is exactly the same, only different shell color choices are new. There is a single vent noted on the back.




Well, 7Hz did it again. At first I didn’t want to like this new Zero 2, yet after a while I truly understood the ideas to why it needed to exist. A fulfillment of a dream to offer the very best sound for under $25.00. And while sure, more expensive IEMs will do better at generating a realistic presentation of your music, I can’t help but be in admiration for simply how even, complete and correct the Zero 2 sounds. That they really did have to offer a new IEM, that is in so many ways complementary to the original. They really do have some aspects the same, but complement each other to where if you had just the Zero 2 in your possession, there still would be nothing wrong with getting the Zero MK1 also. As they both have well done vocals, yet the MK1 has more treble involvement and fireworks for a midrange which is still something truly special. But if you are strictly a Rock listener, I would probably only recommend Zero 2? Maybe?


I would like to thank Kareena Tang from Linsoul for the opportunity to review 7Hz Salnotes Zero 2 IEM.

Linsoul website: https://www.linsoul.com/
Linsoul Aliexpress Store: https://ddaudio.aliexpress.com/store/2894006
Linsoul USA Amazon Store link: https://www.amazon.com/s?i=merchant-items&me=A267P2DT104U3C

Equipment Used:
Sony WM1Z Walkman DAP MrWalkman Firmware 4.4mm and 3.5mm
Sony WM1A Walkman DAP MrWalkman Firmware 4.4mm and 3.5mm
Sony TA-ZH1ES DAC/AMP Firmware 1.03
Electra Glide Audio Reference Glide-Reference Standard "Fatboy" Power Cord
Sony Walkman Cradle BCR-NWH10
AudioQuest Carbon USB
Shanling UA3 Dongle 4.4mm and 3.5mm

These are the experiences and thoughts of a single individual, your results may vary.


Last edited:


100+ Head-Fier
Off to a good start in 2024!
Pros: Price, performance, peak in upper ranges is gone on this version, tuning will be preferred to original for many...
Cons: My tuning preferences lie with the originals...

TLDR version on YouTube: TDLR - 7Hz x Crinacle Zero: 2

The 7Hz Zero 2 have been sent to me by Linsoul in exchange for the publication of this review. Linsoul have not made any requests, they never do, and I will do my usual best to be as unbiased as possible.

You can find a link to the Zero 2 via Linsoul by visiting the version of this review published on my blog.

As always, it is a non-affiliate link.

To avoid being repetetive in my reviews, you can find all the info about how I create the reviews, equipment used, how I receive the products and how to interpret my reviews by visiting: About my reviews



There is a saying that sequels are never as good as the original but there are also exceptions that confirm the rule, so which one is the Zero 2?

As someone who is a huge fan of the original 7Hz Zero, being one of my (if not the) favourite IEMs under 50€, I have to say that the Zero 2 had its work cut out if it wanted to improve on the original while still staying in the price bracket. Well, as far as pricing is concerned, the Zero 2 is $1 cheaper on Linsoul (at the time of putting this review together) than the original, so they are both around 20€, a price point that is certainly well inside the ultra budget category.

Now, my only complaints, which were not even really complaints, about the original Zero was that they looked a bit like a kids toy and that there was a peak in the upper treble that could be a little brutal on occasions, depending on the music.

Therefore, at the same price, all that could be done to make them “better” in my opinion is to improve aesthetics and/or reduce that peak, so let’s see if that has been the case here.



As far as packaging, nothing has changed, at least as far as I can remember. We still get a simple cardboard sleeve with an image of the IEMs on the front, with some very basic specs on the back (mostly in Chinese).

Removing the outer sleeve reveals the IEMs in a simple tray covered by plastic, underneath which we get the cable and 6 sets of multi coloured silicone tips.

The only real difference is that the Zero 2 show Crinacles name on the packaging whereas the original Zero were more of a (not so secret) collaboration.


Build and aesthetics…

Ok, so the first thing I was interested in them changing has not really changed much but at least they are now available in colours that are not so “kids toy” looking. All of this is obviously personal preference but the new colour schemes look better to me personally, maybe except for the blue variant, although, being honest, I think the new blue variant does look better than the old blue variant.

As far as build, everything is the same. They use the same plastic shaped shells, with a metal faceplate, that are very lightweight and cause me no discomfort. In general I don’t have any issues with the build at all and I find the aesthetics are still not my favourite but they are an improvement over the originals.



Moving into the sound category, have they improved that upper treble peak? Yes. Which is of course a good thing.

Is everything else still the same? No. Which is not necessarily a bad thing, depending on personal preferences.

To be honest, the changes in the rest of the frequency range are very minimal, with only really one thing that makes me reach the conclusion I have reached but before getting to that, let’s take a look at the graph which compares the Zero 2 with the original Zero and with my usual preference target for reference:


As you can see in the graph, there is some variation between the models, although they really aren’t quite as noticeable as they may look on the graph. Yes you can hear them, but it is not as though they are totally different tunings, which puts us off to a good start!

The low end is probably the area where most will find the clear difference between the two. While the original Zero ramped up moving from the midbass down into the subbass, the Zero 2 has noticeably more presence in the midbass area. This provides more of a punch in this range and, together with another thing I will mention in a moment, moves the focus more towards the bass range of these IEMs.

For those who found the originals to sound a little lean in the bass, which I know was quite a few people, the 2 will be much more to your tastes with the way it presents the lower ranges. This doesn’t mean that the bass is any less clear or articulate, it still does a very respectable job of controlling the low end, not becoming fatiguing to me at all, even with my preference for a slightly tamer midbass in comparison to the majority.

Moving into the mid ranges, here things have not changed and the Zero 2 still presents a midrange that is very respectable, especially if we consider the price that these IEMs come in at. Instruments do have a little more body due to that extra presence of midbass but they are still very well balanced and natural, as are vocals, throughout the mids.

As we pass through the upper mids, which are again very much in alignment with my personal tastes, we reach the top of these ranges and start moving into the upper ranges and here is where I find the second noticeable change that makes the differences between the two models stand out.

Around the 4kHz mark, the response starts to dip and has much less presence in the 5kHz and 6kHz ranges than the previous iteration. I know I have said that I am someone who is intolerant to 5kHz peaks but I feel that the dip in the 5 to 6k range of the Zero 2 is a little too pronounced. This makes the upper ranges take a bit of a step back compared to the lower regions, and puts more emphasis on that additional midbass that we find on the Zero 2.

It is not as though the IEMs are completely lacking presence, far from it, but they do change what I felt to be a very balanced signature on the originals to something a little more focused on the additional midbass.

Moving past these marks, in the upper treble, that peak that could sometimes appear on the originals is not appearing to me on the Zero 2. Running through some of the same tracks that could be harsh on the originals is much tamer on the new set. The treble in general is more laid back and doesn’t quite seem as airy, with things seeming to roll off.

To be honest, although the treble, or rather upper treble, is not as present as on the previous set, I like that the peak is gone and it can make for a more pleasurable listen when choosing music that is already a little too bright in the upper ranges.



Is the Zero 2 better than the original Zero? In my opinion no.

So the original is better that the Zero 2? I would again say that, in my opinion, no.

They are a different flavour of an excellent set of IEMs for the price they sit at. If I had never heard the originals, then I think that the Zero 2 would probably just to one of the top spots in my personal under 50€ rankings but I was spoiled by the Zero.

As I mentioned before, the 2 things that I had issues with on the original Zero (well, more than issues, I just thought it could be different) were aesthetics, that have been improved on the Zero 2, and the harsh upper treble peak, which has also been improved on the Zero 2.

But now I have a couple of things that I would prefer to be different on the Zero 2. There is a little more midbass which I can live with, so it’s not really a complaint, but that lack around the 6kHz range is something that I find to stand out and it is not something I favour.

There is absolutely no doubt that the Zero 2 are an amazing set of IEMs for the price that they sell for, probably a better option than the originals for the majority of those out there, but I still find myself attracted more to the originals.

As always, this review is also available in Spanish, both on my blog (www.achoreviews.com) and on YouTube (www.youtube.com/achoreviews)

All FR measurements of IEMs can be viewed and compared on achoreviews.squig.link

All isolation measurements of IEMs can be found on


New Head-Fier
𝟕𝐇𝐳 𝐙𝐞𝐫𝐨 𝟐: 𝐙𝐞𝐫𝐨 𝟐 𝐞𝐥𝐞𝐜𝐭𝐫𝐢𝐜 𝐛𝐨𝐨𝐠𝐚𝐥𝐨𝐨
Pros: Nice build quality
Non-fatiguing sound
Great detail retrieval for the price
Clean Treble performance at the price range
Natural timbre
Cons: Vocals can sound lean
Subbass rumble could do some work
Sparse inclusions(nitpicking considering the price these are at)
𝟕𝐇𝐳 𝐙𝐞𝐫𝐨 𝟐: 𝐙𝐞𝐫𝐨 𝟐 𝐞𝐥𝐞𝐜𝐭𝐫𝐢𝐜 𝐛𝐨𝐨𝐠𝐚𝐥𝐨𝐨

|| 𝗜𝗻𝘁𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 ||

This is the all new 7hz Zero 2, the successor to the very popular budget banger, the OG Zero.
Made in collaboration with famous YouTube reviewer, and audiophile, Crinacle, the Zero 2 is released at the same $20 price range.


To save you some time, I haven’t tried the OG Zero to make comparisons on whether or not they are an improvement and if they are worth buying over the original. Therefore I suggest reading other reviews that have this comparison.

|| 𝗗𝗶𝘀𝗰𝗹𝗮𝗶𝗺𝗲𝗿𝘀 ||

I am in no way, shape, or form affiliated with the brands I review and do not give out preview privileges.

This set is sent in exchange for an honest review. There is no material or financial incentive for me to do this review and I guarantee no exchange has been done by both parties to influence or sway our opinions on this product.

My thoughts and opinions are of my own. My experience will entirely differ from everybody else. The contents of this review should not be considered factual as this hobby heavily leans on subjectivity. YMMV.

I don’t do rankings or tier lists as they can get outdated immediately as a reviewer can change their thoughts of a product to a certain extent. If you do want a recommendation then feel free to reach out so I can help out


𝗜 𝗮𝗺 𝗻𝗼𝘁 𝗮𝗳𝗳𝗶𝗹𝗶𝗮𝘁𝗲𝗱 𝘁𝗼 𝟳𝗛𝘇 𝗻𝗼𝗿 𝗿𝗲𝗰𝗲𝗶𝘃𝗲 𝗺𝗼𝗻𝗲𝘁𝗮𝗿𝘆 𝗶𝗻𝗰𝗲𝗻𝘁𝗶𝘃𝗲𝘀 𝗮𝗻𝗱 𝗳𝗶𝗻𝗮𝗻𝗰𝗶𝗮𝗹 𝗴𝗮𝗶𝗻𝘀 𝗮𝘀 𝘁𝗵𝗲𝘆 𝗽𝗿𝗼𝘃𝗶𝗱𝗲 𝗺𝗲 𝗮 𝗿𝗲𝘃𝗶𝗲𝘄 𝘂𝗻𝗶𝘁 𝗳𝗼𝗿 𝗮𝗻 𝗲𝘅𝗰𝗵𝗮𝗻𝗴𝗲 𝗼𝗳 𝗳𝗮𝗰𝘁𝘂𝗮𝗹 𝗮𝗻𝗱 𝘀𝗶𝗻𝗰𝗲𝗿𝗲 𝗳𝗲𝗲𝗱𝗯𝗮𝗰𝗸 𝗳𝗿𝗼𝗺 𝘆𝗼𝘂𝗿𝘀 𝘁𝗿𝘂𝗹𝘆.

𝗢𝗻𝗰𝗲 𝗮𝗴𝗮𝗶𝗻, 𝗜 𝘄𝗼𝘂𝗹𝗱 𝗹𝗶𝗸𝗲 𝘁𝗼 𝘀𝗲𝗻𝗱 𝗺𝘆 𝗴𝗿𝗮𝘁𝗶𝘁𝘂𝗱𝗲 𝘁𝗼 𝗟𝗜𝗡𝗦𝗢𝗨𝗟 𝗲𝘀𝗽𝗲𝗰𝗶𝗮𝗹𝗹𝘆 𝘁𝗼 𝗠𝘀. 𝗖𝗮𝗿𝗶𝗻𝗮 𝗖𝗵𝗲𝗻 𝗳𝗼𝗿 𝗽𝗿𝗼𝘃𝗶𝗱𝗶𝗻𝗴 𝘁𝗵𝗶𝘀 𝗿𝗲𝘃𝗶𝗲𝘄 𝘂𝗻𝗶𝘁. 𝗜 𝘁𝗿𝘂𝗹𝘆 𝗮𝗽𝗽𝗿𝗲𝗰𝗶𝗮𝘁𝗲 𝘁𝗵𝗲𝗶𝗿 𝗴𝗲𝗻𝗲𝗿𝗼𝘀𝗶𝘁𝘆 𝗮𝗻𝗱 𝘁𝗿𝘂𝘀𝘁 𝘁𝗼𝘄𝗮𝗿𝗱𝘀 𝗺𝗲 𝗮𝗻𝗱 𝗼𝘁𝗵𝗲𝗿 𝗿𝗲𝘃𝗶𝗲𝘄𝗲𝗿𝘀.


| 𝗣𝗮𝗰𝗸𝗮𝗴𝗶𝗻𝗴, 𝗨𝗻𝗯𝗼𝘅𝗶𝗻𝗴 & 𝗔𝗰𝗰𝗲𝘀𝘀𝗼𝗿𝗶𝗲𝘀 |


It comes with this compact small box with the common bells and whistles, a picture of the driver on the front and more details at the back. You are immediately greeted by the drivers upon removing the cover whilst encased in foam for shock protection.


Underneath is the stock cable, manual and the provided eartips. Pretty straightforward

𝗜𝘁𝗲𝗺 𝗯𝗿𝗲𝗮𝗸𝗱𝗼𝘄𝗻:
Zero 2 Drivers
Stock 3.5mm 2-pin high purity cable
A bunch of colorful eartips of various sizes

Barebones in terms of the inclusions, but considering the price, one can let it slide. I like the feel and behavior of the cable though even if it’s not braided. The quality of the ear tips are quite middling. They feel a bit cheap in my opinion, but almost all stock tips at this price are the same anyway.

| 𝗕𝘂𝗶𝗹𝗱 & 𝗗𝗿𝗶𝘃𝗲𝗿 𝗖𝗼𝗻𝗳𝗶𝗴𝘂𝗿𝗮𝘁𝗶𝗼𝗻 |

The Zero 2 is built with translucent plastic for the body and brushed aluminum for the faceplate. They look identical to the OG Zero in form. I’m not a big fan of the design but I must admit it is quite iconic after the OG being quite popular. It comes in 3 colors, Blue, Silver and that one we have, the Orange(The best looking one IMO).


It feels nice in the hand despite being made out of plastic. There are no rough edges on the Zero 2 and the aluminum faceplate is a nice touch as well.

Despite the weird design, the fit is universal. There are no fins that may or may not make the fit more comfortable. The nozzle has a lip to help eartips stay in place and the filter is made out of metal. A vent is also located near the nozzle facing inwards.


7Herts made the Zero 2 with the single dynamic driver which is almost a given at this price point.

| 𝗜𝘀𝗼𝗹𝗮𝘁𝗶𝗼𝗻 |

The isolation of the Zero 2 is quite average. They can work for drowning out unwanted noise in a pinch but are still miles away from any active noise canceling.

| 𝗖𝗼𝗺𝗳𝗼𝗿𝘁 |

Because of it having a universal fit and is made out of plastic material, the Zero 2 didn’t incur any fatigue during prolonged testing. The occlusion effect wasn’t that bad either.

** TangZu Sancai(Small) | Zishan U1 | Apple Dongle(Lightning) | TimeEar BTE-222 **

| 𝗗𝗿𝗶𝘃𝗮𝗯𝗶𝗹𝗶𝘁𝘆 |

Given that this only has a single dynamic driver, it is really easy to run. You don’t need any extras to power these to a comfortable level.

|| 𝗦𝗼𝘂𝗻𝗱 ||

In short, these are a balanced set with a bit of spice on the treble. These are definitely less warm than the closest IEM in the price segment I have, which is the TruthEar Hola.

| 𝗕𝗮𝘀𝘀 |

This isn’t the strong suit of the Zero 2. Midbass punches are there but aren’t the most punchy and forward. They do attack fast and decay immediately with only a hint of bleed. The subbass rumble is present but lacks in quantity for my personal taste. It is there, but it doesn’t offer much in terms of depth and rumble

| 𝗠𝗶𝗱𝘀 |

This is where the scales tip in the Zero 2’s favor. It does a great job giving a more forward approach for the vocals. Female vocals sound more forward compared to some male vocals on average. They sound a bit lean and sibilant on some songs though, but instead provide good air. Instruments sound nice and forward, but they could use a bit of note weight. They sound natural at least, there is no weird timbre plaguing the Zero 2.

| 𝗛𝗶𝗴𝗵𝘀 |

This is the area where the Zero 2 excels. They provide good detail, extension and clarity for the price. These sound resolving without being too “coarse” or unrefined sounding. The Zero 2 also doesn’t have much in terms of harshness in this area too except on some extreme instances.
This is one of the best treble performances I’ve tried in this price range and even better in some more pricier items way above the price point of the Zero 2.

| 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹𝗶𝘁𝗶𝗲𝘀 |

Technicalities-wise, It has an average staging but it makes up for it with good imaging, separation and layering. This is good for all kinds of entertainment like gaming or watching movies, however I do prefer and recommend something that has more subbass presence for a more immersive experience.

|| 𝗖𝗼𝗻𝗰𝗹𝘂𝘀𝗶𝗼𝗻𝘀 ||

All in all, the Zero 2 is a nice balance of clarity and tameness. It doesn’t go overboard with the detail at the cost of sounding unrefined or fatiguing. I prefer this more than the Hola for the more revealing sound at the sub $20 price point.


I can definitely recommend this for anyone looking at a very versatile set for around the $20 price range. The only folks I suggest skipping this are those looking for a more warmer and bassier sound.

[| 𝗣𝘂𝗿𝗰𝗵𝗮𝘀𝗲 𝗟𝗶𝗻𝗸𝘀 |]


(𝗧𝗵𝗲𝘀𝗲 𝗮𝗿𝗲 𝗻𝗼𝘁 𝗮𝗳𝗳𝗶𝗹𝗶𝗮𝘁𝗲 𝗹𝗶𝗻𝗸𝘀. 𝗜 𝗱𝗼 𝗻𝗼𝘁 𝗴𝗮𝗶𝗻 𝗮𝗻𝘆𝘁𝗵𝗶𝗻𝗴 𝘄𝗵𝗮𝘁𝘀𝗼𝗲𝘃𝗲𝗿 𝘂𝗽𝗼𝗻 𝗽𝘂𝗿𝗰𝗵𝗮𝘀𝗶𝗻𝗴 𝘀𝗼𝗺𝗲𝘁𝗵𝗶𝗻𝗴 𝘂𝘀𝗶𝗻𝗴 𝘁𝗵𝗲 𝘀𝗮𝗶𝗱 𝗹𝗶𝗻𝗸𝘀)


  • ZVE09896.jpg
    8.9 MB · Views: 0


New Head-Fier
Pros: Build quality and Comfort, Pleasant and Natural Tonality, Punchy and Well-extended Bass, Breath of fresh air from OG Zero (can be a con for those who prefer the OG tuning), Versatile and Coherent Tuning
Cons: Detail Retrieval could be better (am nitpicking, it’s already great for its price), Treble/Highs might be too dull for some



Disclaimer: The 7Hz x Crinacle Zero: 2 was provided to us at no charge courtesy of Linsoul. However, this was done in understanding I was to give my honest thoughts and opinions of the Zero: 2. For more reviews, do check our page www.perrivanaudio.com

The original 7Hz Zero was one of my favourite “ultra-budget” IEMs, despite all the options at a very saturated price point. We are spoilt for choice in this range, with numerous brands having excellent releases, from the Tangzu Waner, Moondrop Chu, and Kiwi Ears Cadenza to these Zeros. When I heard that the 7HZxCrinacle Zero: 2 was released, I couldn’t have been more excited to try them. For the rest of the article, I’ll be referring to these as the Zero 2.



You get the same packaging and accessories as the first iteration. However, they did change the cable to try to get it to fit the overall aesthetic of the earpiece. Quality or usability wise I didn’t find it a huge change. The most noticeable difference is that the new cable is softer and easier to handle (less springy) than the original.

Build Quality and Fit


The build quality is almost the same, given that the design and structure of the IEM are pretty much the same, apart from the new colourways. These now come in 3 colour options, namely Clear, Blue, or Orange (pictured). If the OG Zeros fit well for you, these will too. I do like the new colours quite a lot more than the options we had for the OG and the translucent shells are quite a nice touch.


  • Lotoo Paw S2
  • Fiio BTR7
  • SMSL M200 –> Schiit Magnius

The bass is one of the most transformed regions of the Zero 2, probably due to its new driver. It has a very well-extended bass that has good rumble. The response is also rather punchy and technically competent, without too much midbass bloat. The added warmth is very tastefully done and transforms the tuning. The boost in bass won’t take it to basshead levels but the tuning is more in-line with that of a warm-neutral one.


The mids are quite mellow and tame, given the U-shaped tuning of the Zero 2. Vocals are present but not that forward. There is not much expression and texture in vocals and layering is rather limited. That said, I wouldn’t have been expecting too much for a $20 IEM so what it’s achieved here with the tonality is already impressive. The Zero 2 deftly avoids any sibilant peaks while still managing to achieve great clarity in the upper mids.


The treble and highs carry on the tameness of the upper mids. It has peaks in the right ranges to give it that headspace and also room extension that takes the Zero 2 to the next level. That said, the highs are considerably tamer than the original Zero and give the overall tuning a rather laid-back vibe that you can listen to for hours on end without fatigue. I would say these work well for long hours watching videos or gaming too.


Tuning-wise, the Zero 2 surprised me as it sounded like a different IEM. Putting visuals aside, if there was a blind test, it would have been difficult for me to identify an immediate association with the original Zero. These seem way warmer and more powerful in the low end than the original Zero. It’s not very obvious but the Zero 2 also seems to bring out less detail than the original. That said, the two punches way above the expectations for their price point in terms of technical capability and you won’t be disappointed with the details you are getting out of the two.



Given the differences in the 2 tunings of the Zero 2 and OG Zero, I think 7HZ could very well release these under a different name or line. However, I suppose they would want to ride on the success of the OG Zero. Would I say the Zero 2 is objectively better than the OG Zero? No. I would say the Zero 2 does way better in the lower regions with a punchy and engaging bass that extends well at its price point while maintaining a very coherent tonal balance. It is a great IEM that I enjoy for its fun and warmth on top of its pleasant tonality.

There are aspects of the OG Zero that I enjoy more and can’t seem to find in the Zero 2 and that is okay. You would not lose out if you already own and love the OG Zero, the Zero 2 may or may not impress you but IMO having both would be a good complement to each other for all the repertoire in your music library. If you didn’t like the OG Zero, give the Zero 2s a chance and perhaps these are more up your alley.


100+ Head-Fier
7Hz x Crinacle: Zero 2's Review
Pros: Fun Sound with excellent price performance ratio
Natural timbre
Slight warm and neutral tuning
Commendable technicalities for the asking price
Cons: Smooth treble might not be for everyone
Short nozzle might be an issue for some

7Hz is back with another banger collab with Crinacle. This time, we have the Zero:2, which is an improved version of the OG Zero that was released last year. Some are happy with the OG Zero, some aren’t, so 7Hz collected the feedback and here we have the Zero:2, featuring a new driver for improved bass and mid range, not to mention a better cable that’s similar to 7Hz’s Sonus. Packaging is similar to the OG Zero, the same goes for the bundled eartips, candy coloured ranging from wide to narrow bore, the shape and the build is also similar as to the OG Zero, except the Zero:2 has slight translucent for the colour that i’m reviewing, the silver and blue colour is transparent, i don’t have any fitting issue as with the OG Zero, hence the Zero:2 fits me just fine, but some might find the nozzle length a bit too short, tip rolling may help with this, i am using the Dunu S&S eartip for a better seal and insertion depth.

Gears used for this review
  • Earmen Colibri
  • Earmen Tradutto -> Earmen CH-Amp
  • Hiby R6 2020
  • Colorfly CDA-M1P
  • Zero:2 Stock Cable with Dunu S&S Eartip


My review is solely based on what I hear via my equipment and I never consider my reviews to be objective in any way rather a subjective approach. Do take into consideration that everyone’s ear anatomy is not the same, so the psychoacoustics perception might be different as well, but i believe it will not stray too far

Sound Impression
Zero:2 is a lot more fun sounding compared to OG Zero. Many complained that the OG Zero lacked bass, there you have it, Zero:2, some complained that the highs are a little too much, Zero:2. The driver within Zero:2 is completely new and different from OG Zero, hence, making this tuning possible. The timbre sounds natural to my ears and has very good note weight overall.

  • Bass quality is good on the Zero:2 and has adequate quantity for me
  • The sub bass does rumble when it’s called for but nowhere near basshead territory
  • Mid bass has good slam and punch to it and it is really commendable for its price point
  • Good texture and speed as it is evident on tracks like Slipknot’s People = crap, it’s keeping up and doesn’t sound muddy at all, it doesn’t even bleed into the mids
  • The mids has good note weight to me when listening to Imperial March by Wiener Philharmoniker, John Williams
  • Vocal positioning is slightly recessed but not to the point where it is v-shaped kind of recess
  • Both male and female vocal has pleasant texture and weight to the vocals, they’re not thin sounding
  • Upper mids are safe and no where near shouty
  • Treble has got enough energy and never harsh nor sibilant, very smooth overall but certainly not dark
  • Good amount of air and extension which is quite rare for the price point
  • Nothing much to comment here as the implementation is generally good
  • Something’s got to give right? Well, detail retrieval is average i would say, not really a con but rather nitpicking
Soundstage is slightly out of your head, good depth and height for the asking price.
Imaging is good with the ability to pinpoint instruments easily


Zero:2 is easy to drive but of course when you feed it with a better source, it does perform better. Majority of the dongle will be sufficient to provide a decent experience on the Zero:2.

Comparison (OG Zero)
  • Less bass quantity and a little bit lacking in terms of punch and impact, Zero:2 does this better in terms of quality and quantity
  • Treble has got more energy compared to Zero:2, not exactly a good or bad thing but this is down to personal preference
  • OG Zero sounds a little bit lacking in terms of note weight due to the lows
  • Slightly smaller soundstage compared to Zero:2
  • Overall, my interpretation will be OG Zero will sound cleaner/a little bit technical whereas Zero:2 will sound more fun
Final Thoughts
Not gonna say much but if someone asks me if they should get Zero:2 as their first starter IEM? I’m more than happy to tell them yes, even seasoned audiophiles will like this I'm sure. I for one like them, I take em out and just put them on with my DAP and listen to music without caring much for technicalities or seeking to hear every single detail in that particular track. It is just something that I wear and I listen to music and completely indulge myself into it. An easy rec for Zero:2 in terms of sound and high price performance ratio.

*Zero:2 is sent to me from Linsoul in exchange for this review. I am in no way under any influence nor do I receive any monetary compensation for this review. All thoughts are of my own.

Head over to their store to purchase one if you are interested
7Hz x Crinacle Zero:2 - Non affiliated



New Head-Fier
Another Contender In The Ultra Budget Real ! 7Hz x Crinacle Zero 2
Pros: 1. Detailed Treble
2. Forward and lively mid range
3. Dynamic and physical bass
4. Great technicalities
5. Sounds more assertive and composed than other IEMs around this price.
Cons: 1. Leaner lower mid range

Review Of The 7Hz x Crinacle Zero 2



7Hz, a Chinese company well-known for its full range planar IEM Timeless, is a prominent player in the audiophile market. Their sub-brand, Salnotes, is particularly well-known. This is the company with whom I fell in love with planar technology for the first time. Salnotes made a name for itself with the release of their first IEM, the Zero, which received high marks from audiophiles and was dubbed one of the best under $20. Along with salnotes releases, I also found 7hz releases to be pleasing to my taste and the quality they offer. Recently, the parent company 7Hz released the improved version of the original Salnotes Zero, dubbed the Zero 2. This was a joint project between 7Hz and renowned audiophile reviewer Crinacle, and I had the good fortune to review them. However, I want to make a few points clear before continuing.



*Since this unit tour was organised by the kindly people at Linsoul, I am grateful to them. And as I've said in all of my evaluations, the same is true for this one: all of the concepts I've expressed below are entirely my own, original ideas that haven't been influenced by anyone else. If interested, go to this link.
*I am not associated with the connection, and I receive no financial assistance from anyone.
*For the remainder of the review, I will refer to these IEMs as “Zero 2.”
*I am using different Ear-tips for convenience and better versatility.
*Finally, I will only evaluate the Zero 2 based on their performance, even though I will explain how it feels and seems physically and aesthetically.


Zero 2 used the same 10mm single dynamic driver arrangement as the previous generation, with the exception that the coil and diaphragm are made of higher-quality material in the driver. Perhaps the driver as a whole is different; I was unable to obtain all the information. Although the shell is composed of the same plastic resin as the previous generation, it looks better than the pastel color before set on the previous generation because it is transparent and has a lighter shade. The faceplate is made of the same metal as the one from the prior model. Wearing the shells is comfortable and doesn't make you tired, but after listening to them for hours, the inside of your ears started to hurt. The cable is described as an improved version of the previous generation and is a high purity OFC cable with silver plating. One end of the cable has a straight 3.5mm plug, while the other has two pin connectors. Six pairs of eartips in three different sizes are among the additional accessories. Regarding the technical details, the impedance measures 32 ohms. The frequency response spans from 10 Hz to 20 kHz, with less than 1 percent of total harmonic distortion.



Similar to the Ziigaat Nuo, which I recently reviewed, the Zero 2's sound quality is far superior as an all-around IEM. Even though there are many competitors in this price range, I think the response has been better than with the previous releases because as these audiphile IEMs become more user-friendly, more people tend to become interested, which is, in my opinion, the correct course of action. Apart from its position in the market, Zero sounds much better than Zero, which was also well-received, though some users wanted more, and their voices were heard. Salnotes/7Hz performed an excellent job of tuning into a somewhat gentle V-shape that is captivating to listen to. The dynamic driver allows the Zero 2 to produce a more dynamic and refined sound while producing details that are similar to those of Nuo. Let's talk about the sound in more detail.



A more distant and spacious sound is made possible by the more engaging and presentable treble in the mix, where the Nuo felt a little more relaxed. The notes are of good quality and seem more attention-grabbing because the nuances paint a clearer picture, something the Nuo seems to lack at present. The higher treble range sounds more expansive and present in the mix, allowing for playful closure in terms of details and nuances. There is a sharper, more metallic feel to the response of the instruments and vocals. Collectively I felt that the Nuo was more laid back than the Zero 2 because the notes were of the same quality. Naturally, the lower treble introduces some offensive presentation, which is noticeable in the bright tracks or on loud volume. It also sounds more vibrant and spicy due to a zing in the notes that feels lively and clear. The frequency response graph may indicate a stronger bass presence, but it has little effect on reducing the mix's forwardness and wnwrgy quality. The vocals have a very distinct and charming effect on the listener, and the instruments complement them without sounding harsh, so I believe that the forward presentation makes it sound open. As a result, the treble region is presented in an engaging, clear, and detailed manner overall.

Mid Range

The mix responds very forwardly in the mid range, much like the Nuo or its earlier version Zero. The clarity and details are comparable, but the Nuo sounds more focused and the elevated energy evokes an intimate response. The Nuo had a smoother, more sophisticated feel. The vocals in the upper mid range are crisply defined and suitably detailed, feeling more slender and light than luscious or warm. They may even have a little more energy than in the lower treble. Compared to the Nuo, the instruments feel clearer and each note presents itself slightly differently, making it a superior imaging and layering IEM.For the notes to sound more tonally comfortable and natural, the lower mid range should have sounded denser; this is where I think Nuo performed a better job. The notes respond more clearly, and the note weight feels appropriate. Although I would have preferred it, it is not a drawback, if the notes were denser, they would have sounded more melodic. As a result, the mid range region is presented in an approachable, transparent, and open manner overall.


When it comes to this tuning, I think the bass is among the best. The wan'er bass, which I thought was among the best, can be related to the bass's superior physicality and effect. Wan'er and Zero 2, which offers the best of both worlds and truly appeals to my taste, are still my favorites. The sub bass range is highlighted, and there is a nice rumble in the ear canals along with powerful punches. They don't hesitate to withdraw or act possessively, but the quality is alluring. The midbass has a good slam, but it also has a thunderous thump that strikes quickly and subsides without sacrificing the bass's quality or texture. In my opinion, the mid-bass is well-balanced, providing a realistic and resonant bass without being overpowering or underwhelming. Whether it is the sub bass or the mid bass, the bass really feels very satisfying and has such an effective impact. The mid bass does, in fact, leak into the lower mid range, even though it doesn't feel like it does. The higher frequencies sound drier than warm because the warmth doesn't extend into them. As a result, the bass region's overall temperature presentation is tangible, significant, and organic.

Technical Performance

With the exception of superior imaging and more audible details in the mix, the technical performance is comparable to that of the Nuo. Let's talk about this in more detail.


Soundstage, Sound Imaging & Separation

The stage feels more completely surrounded than average in size. Among the best audio available in this price range, the imaging is crisp and clear. The elements are given more definition by the noticeable and sufficient distance separation. The source of the sound is easily identified.

Speed & Resolution

Although the details are more expressive than the Nuo, the resolution is still far better than expected for a rival IEM. When the bass thumps and slams, the attack and decay of notes are likewise fast-paced, and they resolve without creating a mess.

Sound Impressions


Sony WM1A - Using the WM1A, I discovered that Zero 2 had a more mature and laid-back sound. This was achieved by reducing the intensity of the high frequencies, allowing the warmth of the mid-bass to permeate and create a more organic tone while preserving the accuracy of the details. The sound got wider and more energizing to listen to. This pairing really appeals to me.


Tempotec V6 - The V6 produced a clearer, more detailed sound when listening to Zero 2. The treble seemed more invigorating, which resulted in a more focused response and the addition of harsh noises to the mix. The bass had a better sense of control and texture, which improved the perception of the instruments' sound.


Musehifi M4 - With the exception of the response not being overly analytical, the Zero 2 and M4 pairing was more rich and full-sounding, with good dynamics in the lower notes and appropriate energy, allowing for a more consistent sound with the same representation as the V6. The lower mid range was a little elevated, perhaps as a result of the muted higher frequency or the push from the M4, even though I did find that the vocals were more pronounced in the mix and never had a chance to come through. This sound type appeals to me.


Luna Haruna - Glory days
Luna Haruna - Overfly
Rokudenashi - The Flame of Love
LMYK - 0 (zero)
Marina Horiuchi - Mizukagami no Sekai
Indila - Love Story
Indila - Tourner dans le vide
Earth, Wind & Fire - September
Tom Petty - Free Fallin'
Fleetwood Mac - Everywhere
Nirvana - Smells Like Teen Spirit
Blue Oyester Cult - (Don't Fear) The Reaper
Guns 'N' Roses - Sweet Child O' Mine
The Police - Every Breath You Take
Gojira - Amazonia
TV on the radio - Wolf Like Me
Bring Me To The Horizon - Can You Feel My Heart
Bring Me To The Horizon - sTraNgeRs
Avril Lavigne - Dare To Love Me
Travis - Love Will Come Through
Gotye - Somebody That I Used To Know
DJ Shadows - Six Days (Remix) [feat. Mos Def]
Lady Gaga - Just Dance
Lil Wayne - Lollipop
Flo Rida - Low
Sebastian Lopez & Flug - Electronic Measures
Federico Mecozzi - Blue (Da Ba Dee)
Wayve - Not Enough
Kai Wachi & TeZATalks - Ghost
NGHTMRE, Zeds Dead & Tori Levett - Shady Intentions
Zeds Dead, DNMO & GG Magree - Save My Grave
Skrillex, Noisia, josh pan & Dylan Brady - Supersonic
Skrillex & Nai Barghouti - Xena
Skrillex, Missy Elliott & Mr. Oizo - RATATA
Kaifi Khalil, Eva B & Wahab Bugti - Kana Yaari
A.R. Rahman, Javed Ali & Mohit Chauhan - Kun Faya Kun


To sum up this review, the Zero 2 is an incredible ultra budget IEM that improved upon the shortcomings of the Zero by bringing a better sound profile. One of the IEMs that has recently raised the bar in the ultra budget market is the Ziigaat Nuo, and Zero 2 has followed suit. A combination of playful and analytical sounds makes Zero 2 a worthwhile endeavor. Zero 2 is highly recommended by me.

What are these tips you're using? They look pretty dope 👌
Azla Sedna Crystal


New Head-Fier
7Hz X Crinacle: Zero 2 review of dynamic iem by ICYGENIUS 🎧
Pros: Nice neutral and neat tone
The amount of low frequencies is optimal
Sub bass is deep and massive
Mid bass has excellent punch and control
Textural bass development is excellent for a dynamic driver
The mids are not bright and have a smooth tone
The upper mids are neutral and have excellent transients highlighted by the drums
High frequencies are neat and do not hide details in the music
The sound stage is very wide and the depth is good
Cons: I would like to get more transparent and long-lasting high frequencies
Hello, friends!
Today in the review we will talk about the budget dynamic new product 7Hz.
This model comes in a small but nicely designed box, on the front there is a picture of the headphones themselves in the blue color I chose, and the model name here at the top - Zero 2.

Well, the technical specifications, as usual, are indicated on the back, and a 10mm dynamic driver is responsible for the sound, and the sensitivity of the Zero 2 is 108dB and they received a standard 32ohm impedance, I’ll say right away that the headphones are quite easy to drive.

Let's take a look at what's included!
And first of all, we are immediately greeted by the headphones, and as for me, the 7Hz ones look very good, especially in this color!

And on the front part of the 7Hz there is a metal insert with the inscription Zero 2 and of course, I’m glad that they got a standard 2-pin connector that fits exactly in line with the case.

And on the inside of the 7Hz there is a transparent panel and you can even see the driver itself next to which there is a compensation hole.
Well, the diameter of the sound guide is the standard 0.5 centimeters!

And yes, of course, there are accessories, the 7Hz comes with this fairly standard and thin copper cable with a 3.5 jack plug and 2-pin connectors for connecting to headphones.


And there are also these multi-colored ear tips of different sizes, I think you can easily choose the ones that suit you.

How do these headphones sound?

Well, now we come to the most interesting part, namely the analysis of the sound of the 7hz Zero 2 headphones.
This is what their frequency response graph looks like.

Low Frequencies:
Out of the box, the Zero 2 solid and sublime amount of bass is immediately noticeable, the subwoofer effect here is quite pronounced, and the midbass has good punch and control.
But with regards to the texture and overall clarity of bass tones, everything is pretty good for a dynamic driver.
And the speed and execution of attacks here is good in this price category.

Mid Frequencies:
In Zero 2 we have a neutral and restrained correct tone without any unnecessary obvious emphasis on the upper middle area, that is, I would definitely not call them flashy.
The vocals do not sound thin and have a lot of weight and good filling of space, and I am pleased that in this area they do not emphasize sibilants and various hisses in the voice, which is very important, I think for many, and the drums have quite confident emphasized transients and do not take on too much attention.

High Frequencies:
7Hz sound very pleasant to me, quite neutral and neat without excessive brightness and sparkle on cymbals with slightly muffled distant highs, but at the same time they do not lose their detail on the cymbals, and with technicality in this model everything is quite good.
But it’s also worth saying that the 7Hz Zero 2 are less critical to the recording quality, since they play mostly as is, and don’t really try to add something of their own in this area and highlight cymbals and percussion above all else.

Stage and stereo panorama:
The scene and visualization in 7Hz Zero 2 turned out to be well-developed in width, of course, without any record space, but I wouldn’t say that everything feels crumpled and squeezed, no, on the contrary, we have good and, most importantly, legible drawing and construction of plans.
My conclusion on these headphones:
7Hz Zero 2 turned out to be more neutral headphones with an excellent emphasis on sub-bass and a neat, non-tiring, smooth presentation without a clear emphasis on analytics, so they are perfect for calm, leisurely listening.
Link where you can buy them!
Linsoul : https://www.linsoul.com/products/7hz-x-crinacle-zero-2
Icygenius was with you, I will be glad if you subscribe to my YouTube channel and watch this full review on 7hz Zero 2 !
@bithalver there is enough of it, but these are still not basshead model, if this is not enough for you, then they respond perfectly to the equalizer and even then they sound even more interesting, you can try 120hz 5db and 0.7 Q
Question is not if sub bass is enough for me but saying it is massive can make a feeling about the Zero2 being a basshead IEM (which is not).
@bithalver massive bass does not mean basshead, the zero 2 has a good weight, if it were a basshead set I would definitely write this, this is the optimal starting point in bass which should be enough for you everywhere if you are not a super basshead, also pay attention to my target for understanding.


100+ Head-Fier
Our Lord Crinacle Tuning for the Masses
Pros: +Tuning
+Deep & Impactful bass
+Smooth Treble
+Referenced Type Midrange
Cons: -Feels Rather Cheap
-Resolving Capabilities
7Hz Zero 2

DSC00038 Cropped.jpg
Before I start this review, let me thank Linsoul for sending the Zero 2 in for review,
rest assured, as always my review is 100% my own personal opinion.
Just in case you're interested on getting the Zero 2, you can purchase it directly from Linsoul link below.


Build Quality

Probably the only thing I could nitpick from this IEM.
The shell is made out of plastic, while the faceplate is metal, the build should be the same like the Zero 1 / Zero OG, but somehow the transparent shell made it feels (at least to me) on the cheaper side, but on the plus side, it is very lightweight.
Cable is also feels a bit cheap, though it is functional. It uses the 0.78mm 2pin connector.

is very comfortable thanks to its lightweight shell, it practically disappear from my ears after wearing it for a while.


Tested using : FIIO KB3, FIIO BTR15, stock cable, stock eartips
Music is mostly from Apple Music (J-POP, J-Rock, Anisong, EDM, Rap, Jazz, Metal)

Tonality in General : Bass Boosted Neutral

Bass is noticeably boosted, more boosted compared to the OG Zero. It has a generous bass boost ranging from sub-bass ending around 300hz, the main focus here is sub-bass.

Bass presentation is deep, impactful and satisfying.
Bass quantity is not on bass head level but it has decent amount of bass for sure.

Speed of the bass itself is normal, not super speedy nor slow, it still capable to play your favorite double pedal metal tracks, so no problem there.

Midrange is just like OG Zero ,it has reference type midrange, very good clarity without getting shouty and nassaly.
Male and female vocal rendered beautifully, no complaint here, in fact it is tuned better than A LOT of more pricier price tag IEM.

As for instrument, tested on Violet Evergarden OST, violin sounds very real and convincing, the only nitpick I can think of while listening is that the detailing /resolving capabilities is not as good as your more premium price tag model.

Treble is smooth, very safe for treble sensitive person.
It feels somewhat rolled off on the upper extension, but I guess it is to be expected from a single DD ultra budget categories.


is very good, it has rather large sound stage for its price and has exact wall placement and the shape is symmetrical in width and depth.

Imaging is good, it sounds 2.5D, it has very good object rendering, but definitely not on the holographical level.

Separation and Positioning is very good, in fact it dethrones my CHU 2 my daily driver for playing Valorant, Separation is well separated for a single DD ultra budget categories, and positioning is very good, no problem searching footstep (in games) and where object positioning in general.

Detail retrieval is good for its price, it has decent amount of details, but lacking the resolving capabilities of your typical more premium model.


Moondrop CHU 2

CHU 2 build quality is better since it is full metal build, sound wise, the Zero2 has more bass compared to CHU 2, stage size is larger on the Zero2, and thanks to that, separation and positioning is also a bit better because of the more larger stage size.

7Hz Zero OG
The Zero OG sounds more lean compared to the Zero 2, it has less bass boost and more or less same presentation on the mids and treble.
But because of the less bass boost on the Zero OG, the OG somehow sounds more “balanced” compared to the Zero 2, while the Zero 2 to my ears sounds more focused on bass and mids and more fun sounding compared to the Zero OG.

Technicality wise, the Zero 2, is a bit better on all aspects compared to the Zero OG.


Do I recommend the Zero 2?
Absolutely, the Zero 2 is definitely one of the better tuning IEM regardless of the price bracket.
Even better if you're a Crinacle fan or want to support his work.

The only thing I can nitpick on the Zero 2 is that the body and cable somewhat feels cheap and the resolving capabilities is not trying to punch above its price bracket (though it is still good for its price).

Thanks for reaching this far,

Just in case you're Indonesian or understand Bahasa Indonesia, you can watch video review of the Zero 2 here

Last edited:


500+ Head-Fier
7Hz Zero II: Affordable & Competently Tuned
Pros: ● Lightweight yet sturdily built composite shell chassis.
● Uniquely designed shells yet it offers a well- ergonomic fitting.
● 0.78mm 2-pin connector which is an unusual implementation on a budget and entry-level set.
● Inclusion of good amount of ear tips.
● Mild U-shaped tuning that has an engaging, pleasing and fun factor on its tonality while maintaining a well-balanced sound.
● Punchy and precise bass response
● Clean, transparent and lush midrange
● Vocal versatility and natural sounding instruments.
● Smooth and pleasant treble response.
● Sibilance was kept under control and not a whiff of harshness.
● Most of its technical capabilities are quite appropriate for its price.
● A prelude set for budding audio enthusiasts who want to have a neutral-sounding set at an affordable price.
Cons: ● Its bass depth, volume and texture seems still a bit lacking to sound more engaging for adherent bassheads.
● Wishing for a better stock cable.
● That angular and edgy design of its shell might be an issue to someone's ears
● Trebleheads might want more shimmer and more airy extension.
● Less defined layering capability.

"When one's expectations are reduced to zero, one really appreciates everything one does have."

~~Stephen Hawking, British theoretical physicist and cosmologist, Author of A Brief History of Time.

7Hz is an audio company that made some game-changing moments that shifted the landscape of the audio market in 2021 with their highly successful model, 7Hz Timeless. This year is also the release of 7Hz Legato which is also gaining some cult following from audio enthusiasts who want a different take from usual Harmanish U-shaped sounding IEMs that keeps flooding in the market recently and want to experience that analogue-ish hi-fi sound from vintage speakers.


And what I have right now is their latest offering in the entry-level segment, The 7Hz Zero II. This model is actually a collaboration project between 7Hz and Crinacle, a well-known YouTube personality that specialises on audio engineering and a professional in this particular field. They have had some previous collaboration projects before and this makes the 7Hz even more reputable and a trustworthy audio company in the eyes of audio enthusiasts.


7Hz Zero II is a single dynamic driver IEM and it is a follow-up model from the previous Zero (I don't have one so I can't share my thoughts on what's the difference between these models). It has a 10mm dual chambered dynamic driver with a diaphragm made of composite materials like polyurethane and a thin metal alloy sheet. The dynamic drivers are quite nimble and responsive , capable of delivering a deep and slamming bass response while having a good articulation of its notes, crisp and clear sound on other parts of the frequency range.


The drivers are then encapsulated in a composite shell chassis with unusual angular design but I don't have any ergonomic issues in terms of fitting them. The cavity base of the shell is made of acrylic resin and it was reinforced by a stainless steel faceplate that underwent some treatment process to achieve its finish on its surface. Its overall design cues remind me of some robotic parts that give its Mecha-inspired look along with a copper-coloured faceplate that really matches well. It uses a proven 0.78mm connector on this set rather than usual QDC-type bi-pin connector which are prevalent to other units in the same price bracket.


As I mentioned regarding its angular design of its shell on how it was in terms of wearability, I don't really encounter any major issues when I snug it into my lugholes as it is really comfortable to wear in a long listening session and even my daily physical activity. It offers a good passive noise isolation as it is able to block some unwanted external noises from the surroundings I'm into.


The stock cables appear to have parallel wirings that are insulated and the wires are made of high purity oxygen-free silver plated copper that are woven and winding to have more firmness and better transmission of the audio signals. On its end, it has a gold-plated 3.5mm SE as its standard termination jack.


The product presentation of 7Hz Zero II is quite elementary and its inclusions are pretty bare bones, but at least it pretty takes all the basics on using this set.


Here are the following inclusions inside of its packaging box:

■ Pair of 7Hz Zero II
■ Stock cable
■ 6 pairs of multi-coloured narrow-bored ear tips in different standard sizes.
■ User's manual


As for power scaling and amplification performance, 7Hz Zero II is indeed an easy to drive set that devices like smartphones and tablets which have a sufficient power output to drive some low impedance devices are enough to amplify this set with its dynamic and fullest sound quality.


To determine its tonality, 7Hz has a mild U-shaped sound profile with a hint of warmth that gives me that almost "warmish-neutral" tonality as how all frequencies were presented in a sonic spectrum in an almost linear delivery into my ears. This type of tuning is indeed a rarity in this particular price range at all.


(Graph was provided by @baskingshark , credits to him)


The parts of low frequencies are equally presented in the overall sound as both sub bass and mid-bass were conveyed evidently across the sonic spectrum. It has a punchy, precise and clean bass response.

There's a discernible rumbling and reverberations generated from sub-bass focus instruments like synthesisers, octabasses, drum machines and low tone bass guitars. Mid-bass has an ample texture and density on its note weight, albeit it's a bit lucid and inadequately dark pitch on how it plays into my lugholes. But they are more of a minor issue that I'm quite finicky about but at least it has a fairly texture mid-bass that doesn't bleed too much across the midrange. Bass guitars have resonant and less weighty sound on them while bass kick drums have thudding and rumbling sound on very strike on its head drum, and then on bass baritones vocals, they have a wool-like sound but due to its lucid nature, it has less depth, less broad and darker tone from their distinctive voices. But this kind of bass response shares a similar response with "neutral" sounding sets that I've tested and I'm also a neutral-head so give this one a high mark.


The midrange presentation of this one is noticeably tad notch but it maintains an adequately textured, warmth with sufficiently vivid sound and a tinge of transparency on it. These characteristics will have its versatility on projecting some vocals will sound more closer to its intended tonal colour while the instruments sound more natural on how they deliver their attack and its variable notations.

Male vocals are fairly texture and depth with some warmth on it to give a more organic sound. Some baritone vocals sound very beautiful and engaging as light and lyric types have these mild, sweet and mellow sound characteristics from them. Tenors, particularly on leggero and lyric ones have sufficient bright, warm and dignified sound that really mesmerises me. Countertenors have a tender, smooth and graceful sound on them that it also happens that they also share similar vocal traits with mezzo-sopranos.

As for female vocals, they sound quite pleasant, expressive and emotive that makes them even more engaging to listen to their hypnotic voices. Contraltos have ample lush and richness on their voices although I'm still looking for more depth to their vocals. Mezzo-sopranos sound smooth, tender and radiating on their vocals. Sopranos vocals have its shining, gleaming and silkiness that it will be more beneficial for dramatic and soubrette types but due to this set's inherent smooth tuning, it might affect some timbre on coloratura sopranos with their high pitch vocals as it dampens a bit on energetic sound but in exchange, it will deliver more smoother and a non-shrilling vocals.

Instruments sound relatively natural and it has some lushness on them. On strings, guitars sound a bit buttery and midrange-y on every plucking of its strings while violins have lustrous and sweet sound on every grip on its bow strings. Woodwinds instruments like piccolos, flutes, clarinets and saxophones, piccolos have delicate and graceful sound, flutes have mellow and ethereal sound on every blow on its mouth hole to generate those distinctive note and pitch, clarinets have warm and velvety sound and saxophones have sombre and bit hollow sound on them. As for brass instruments, trumpets sound magnificent, horns have a velvety and warm sound and trombones have rounded and soft sounds on them. Percussives instruments like snare drums, tom-toms, field drums and kettledrums, snares have shuffling yet clear sound while tom-toms have warm and resonant sound, field drums sounds quite full with a hint of sombre on them and kettledrums have orotund and resonant sound. Pianos have sounds so well-balanced as it has a sweet and rich sound on them with sufficient brilliance on them.


The treble response of Zero II is definitively smooth and balanced one as it has a gradual elevation on the upper midrange and a somehow a noticeable dip on the presence part of treble region thats gives a smooth, non-sibilant and devoid of harshness which will devoid any harshness and jarring sound. Despite that tuning in the treble section, it is able to give an enunciated attack of instruments especially on percussives and keeping a good clarity.

It has an enough sparkle and the airy extension of this set is on the modest side. Cymbals have an adequate shimmer and soughing sound while hi-hats were accurately depicted as a distinguishable shortened buzzing sound. Glockenspiels' sounds have a bell-like sound on them and Celestas have those mellow and lustrous sounds to give that "heavenly" vibe tone.


On how I perceived its sound/speaker stage and its stereo imaging, it has an average to above-average size as it has a wider than the usual average width on some IEMs in this particular price range, decent height ceiling and depth distance in my headroom. And as for imaging, it projects a typical two-dimensional stereo presentation where I can decently locate the placement of instruments and singer(s) in both sides of stereo channels. It has a good separation and layering capability is rather decent on this one for its price. In some complex multi-instruments tracks that I've usually played to do some testing, there are some instances that it tends to struggle a bit on projecting all instrumental elements in my hearing.

It has very coherent performance on its capable composite driver as it is quite snappy and it has faster transient response on it. It has a good resolution capability as decent detail retrieval and solid macro-dynamics that has a substantial impacting notation attack.



● This product from TINHIFI, like the Zero II, has a dynamic driver with composite diaphragm but different material composition and it was encapsulated in a mecha-inspired shell chassis. Both sets have similar inclusions as C2 has also a lot of spare ear tips.

● C2 has a bright U-shaped sound in contrast with Zero II which is on the "warmish-neutral" side of tuning. C2 has a tighter and incisive bass response that focuses more on the sub- bass than mid-bass. It has more recessed midrange but it is crisp and energetic tone and a tad brighter treble response that cymbals sound a bit splashy and noticeable shouty female vocals. On the technical performance, both sets have almost similar performance but C2 has a sharper definition on micro-detailing.


● This set has a 10mm LCP dynamic driver and it was encapsulated in a composite shell chassis just like the Zero II but it takes a shape like a fin of a shark and teardrop-shaped metal alloy faceplate. It has less number of ear tips included inside and its stock cable looks more sophisticated but still on the lean side.

● EW100P is a U-shaped sounding IEM that follows a Harman curve tuning. It has more sub-bass focus bass response as it has rumbling presence and a bit hollow mid-bass while its midrange is more recessed on present and sounds leaner but it is quite energetic that is good for strings, woodwinds and some female vocals. Compared to Zero II, it has more emphasis on the upper mids to have more crisper and more definition on instruments and percussive attacks. On technicalities, EW100P has smaller soundstage dimension and its micro-detail retrieval is rather average on how it barely extracts some nuances of information from an audio track, but the rest of technical performance is quite close.


● This set, like the Zero II, has a single dynamic driver configuration and it was encased in a polycarbonate plastic shell with geometrical lines and design cues from Tang dynasty era. It uses a PET diaphragm on its single DD while its choice of connector is a QDC-type connector and its stock cable is braided .

● Wan'er SG somewhat shared some similarities with Zero II in terms of tonality but I will point out the difference that sets them apart. It has a warm U-shaped sound profile as it more slam and punchy bass response with more solid mid-bass texture but it has noticeable bass bleed on midrange, a bit recessed midrange presentation but due to its more warmer tuning, it gives more texture and volume on some vocals and a more organic sounding instruments. It has similar treble response as it is also smoother and pleasant for treble sensitives but it has less sparkle and its airy extension is rather unexceptional. Technicality-wise, both sets have similar sound/speaker stages and also share a typical 2-dimensional stereo panning, but the separation and layering, Zero II is a bit better as it has more spacing on instruments and its layering is also more noticeable. On resolution capabilities, they are trading blows as Wan'er SG has more solid macro-dynamics while Zero II is a little bit better on micro-dynamics.

As I end my assessment on this product, I've just witnessed the evolutionary process and tonal refinement of the entry-level sets as it is apparent that the sound quality of a midrange set from the last decade will be carried through in a more budget-friendly and affordable set like the Zero II. 7Hz Zero II is definitely a worthwhile set that is truly a monumental effort from both 7Hz and Crinacle that they were able to bring a more mature and well-refined sound quality to the masses. Job well done, 7Hz!

7Hz Zero II
is now available at LINSOUL, check out the unaffiliated link below that I've provided.

LINSOUL: https://www.linsoul.com/products/7hz-x-crinacle-zero-2

Also, you can check out my review of their previous product release.




PLUG TYPE: 3.5mm

Some Tracks Tested: ( * = 16-bit FLAC, ** = 24-bit FLAC, *'* = MQA, '*' = DSD, *'= .WAV)

Alison Krauss -When You Say Nothing At All *
Jade Wiedlin - Blue Kiss**
Led Zeppelin - When The Levee Breaks **
Mountain - Mississippi Queen *
Queen - Killer Queen **
Guns N' Roses - Patience *'*
Eric Clapton - Tears in Heaven '*'
Sergio Mendes- Never Gonna Let You Go '*'
Pearl Jam - Daughter **
Roselia - Hidamari Rhodonite *
Assassin - Fight (To Stop The Tyranny)*
Celtic Frost- Visual Aggression *
New Order - Blue Monday *
The Corrs- What Can I do (unplugged version) *
Jimi Hendrix Experience - Voodoo Child *
The Madness- Buggy Trousers *
Metallica - Motorbreath **
Mariah Carey- Always Be My Baby *
Destiny's Child - Say My Name *
Malice Mizer- Au Revoir *
Mozart - Lacrimosa *
New York Philharmonic Orchestra - Dvorak- Symphony 9 " From the New World." *
Eva Cassidy - Fields of Gold (Sting cover)*
Michael Jackson - Give In To Me *
Exciter - Violence and Force *
Diana Krall - Stop This World **
Debbie Gibson - Foolish Beat *'*
The Sisters of Mercy – Lucretia My Reflection**
Suzanne Vega – Luka **
Lauren Christy – Steep *
Ottoman Mehter - Hucum Marsi *
Diana Damrau - Mozart: Die Zauberflöte*


I am not affiliated to 7HZ nor receive monetary incentives and financial gains as they provide me a review unit for an exchange of factual and sincere feedback from yours truly.

Once again, I would like to send my gratitude to KAREENA TANG from LINSOUL for providing this review unit. I truly appreciate her generosity and trust towards me and other reviewers.

Last edited:


New Head-Fier
7Hz x Crinacle Zero:2 - Second Times a Charm
Pros: Warm neutral tuning
Enhanced Bass compared to original
Coherent sound
Clear and open midrange
Organic playback with good timbre
Balanced and smooth treble delivery
Balanced soundstage
Cons: Not as detailed as original Zero
Bass detail could be better
Treble will be heard as being safe by some


The 7Hz Zero2 is the second iteration of the well received original Zero. This time around 7Hz continues its collaboration with Crinacle while upgrading the driver, cable and tweaking the tuning.

Boasting a single 10m dynamic driver, the Zero2 is the epitome of simplicity as far as driver count and tech goes. This could actually be a good thing as in the right hands, less is usually more.

The Zero2 is easy to drive and I would recommend a more neutral source since with it’s new found bass prowess, things may get out of hand when driven by an overly warm source. Tip selection is as something to experiment with not just for fit, but to find that synergy which results in the best sound. I used a shorter wide bore tip with great results and recommend that tip rolling be standard procedure for any new iem.

As far as tuning does, the Zero2 offers a warmer, more v-shaped sound with enhanced bass emphasis as compared to the original which leaned more towards the bright/neutral side of things. Comparatively what’s on offer here is a fuller/weightier sound than its predecessor.

Read on to find out more.


Frequency response range: 10HZ-20KHz
Impedance: 32 ohms
Total Harmonic Distortion (THD): <1% at 1KHz
Driver: 10mm dynamic driver
Cable Interface: 3.5mm
Plug Type: Detachable 0.78mm 2Pin
PRICE: $24.99 USD


What was said in my original Zero review stands here. The Zero2 uses the almost identical shell which I found comfortable. The iem is well built and the colour options are a nice touch. Some have expressed concerns with its angular design. I did not have any issues securing a comfortable and stable fit. The Zero2 is small in size with a nozzle that some may find does not protrude enough to get a good fit. My advice for those people is to go down one tip size and try it that way. I now regularly go from large to medium tips with great success getting a deeper fit for those iem where fitment may be an issue.

The quality of the included accessories is fine but the new cable deserves a mention. 7hz has done their homework here and the updated cable is now a keeper. Haptics are great and it is attractive while also being resistant to tangling. Nicely done 7Hz for stepping up their stock cable game.





The 7Hz Zero2 compared to the OG Zero is a different beast altogether when it comes to bass. While the OG’s low end was “tentative” at times, the Zero2 unashamedly flaunts its new found bass prowess.

Both mid-bass and sub-bass have a newly found richness and drive that is pleasing without dragging down the rest of the frequency range. This bass has a nice thickness to it while exhibiting admirable control. Rumble is there for sure when called for without the limited nature heard in the original Zero. What is pleasing is how the bass does not impede the rest of the frequency range, rather it serves as a solid foundation. The mid-bass though does impart a degree of warmth to the lower midrange which adds wholeness without the corresponding veil that is heard in many other iem in this price range.

Bass quantity aside, the quality is above what one would expect in a $25usd set. Still the Zero2 is not that bastion of detail and texture retrieval in the low frequencies. Make no mistake about it, it does better than most in this price range but is bested on the metrics of detail and texturing by a small number of competitors including the ZiiGaat Nuo. That being said the Zero2 does have more sub-bass slam than the Nuo is capable of.

The bass of the 7Hz Zero2 is a pleasant surprise and I have to say enjoyable.


The midrange of the 7Hz Zero2 receives a touch of warmth imparted by the mid-bass. This does not in any way cloud or obscure the midrange. The Zero2 does pull detail from tracks but predominantly of the macro variety. The midrange also sounds decidedly open and clear. I listened to a much more expensive set right before the Zero2 which usually allows me to hear the midrange veil of the less expensive set but not so with the Zero2. The Zero2 was not as resolving nor revealing as the pricier set, but held up well in particular when its price was considered.

Vocals, both male and female are clear and distinct sitting comfortably with the instruments. Tracy Thorn’s lush vocals on “protection” by Massive Attack are heard just slightly recessed but with great clarity. Anita Baker’s classic track “Sweet Love” followed suit her vocals coming through with again good clarity.

Male vocals also fared well. On “Tenderhearted Lover” by John Stoddart, there was that warmth with no sacrifice of clarity. In fact, the lower midrange sounded more immediate than the slightly recessed upper mids.

The upper mids showed no harshness nor grain. Timbre was good with at time some nicely organic playback heard. Listening to “In Passing” by the Robert Glasper Trio, the Zero2 exhibited a meatier sound presentation but with good organics, timbre and pace.

The handling of dynamic passages was done well with transients following suit if for a softening of the leading edge but with natural decay.

The midrange of the Zero2 lends itself to long listening sessions and is pliable to any genre I cared to listen to. Seen through a more critical lens, the mids are not the pinnacle of micro detail retrieval nor lushness, but at its price joins only a very small number of other iem that can pull off an organic presentation. Nicely done.


Comparatively, the treble of the Zero2 has less prominence than that of its predecessor the Zero. This has as much to do with the bass emphasized tuning of the Zero2 as to an overall tuning change up top which comparatively is safer than its predecessor.

Treble delivery is fairly detailed and smooth as well as being non fatiguing, with enough detail, sparkle and air to keep the Zero2 from sounding dark or closed in. In this regard the treble is well done and I did not find myself wanting more, even though I have a soft spot for bright/neutral tunings of which the Zero2 is not.

The treble has enough vibrancy to not be forgotten in the mix. Treble heads may not be totally happy, but you can’t please everyone. The treble is balanced and non-invasive taking its rightful place in the mix.



The 7Hz Zero2 throws up a moderate sized soundstage with accurate instrument placement. No dimension overshadows the other which IMHO makes for a more immersive and organic experience.

Layering and separation are commendable and serve to keep each element in its own space. Nicely done for a $25 set really.



The 7Hz Zero2 is a good iem but I am taken back by its naming. Through my listening I kept being reminded how different it is than the original Zero. Realistically the Zero2 could have been named something completely different and it would still fly.

What 7Hz has done here is listened to the gripes expressed about the original Zero and addressed them. In this regard they should be applauded for at least listening and more importantly acting upon users concerns.

The Zero2 is a good iem and even though it occupies a pricing tier that has a few strong competitors, it carves out its own space. It joins a small number of standout sets that I believe the majority of shoppers in this price range will enjoy.

The 7Hz Zero2 gets a strong recommendation.


  • PXL_20231209_170016590.PORTRAIT.jpg
    3.7 MB · Views: 0
  • PXL_20231209_170016590.PORTRAIT.jpg
    3.7 MB · Views: 0
Last edited:


Headphoneus Supremus
Pros: Excellent price-to-performance ratio
Good build
Moderately easy to drive
Pleasant warm neutral tuning
Smooth treble with no fatigue
Organic timbre, with lush tone
Above average technical chops for a budget single DD
Cons: Similar to predecessor, the perpendicular edges may on occasion be uncomfortable for some
Some slight resolution loss from the original Zero
Not for trebleheads

I would like to thank Linsoul for providing the Zero 2.
It can be gotten here: https://www.linsoul.com/products/7hz-x-crinacle-zero-2 (no affiliate links).

Zero 8.jpeg

  • Driver configuration: polyurethane + metal 10 mm dynamic driver
  • Impedance: 32 Ω
  • Frequency response: 10 Hz - 20 kHz
  • Sensitivity: 108 dB/V
  • Cable: 2-pin, 0.78 mm oxygen-free copper silver-plated cable; 3.5 mm termination
  • Tested at $24.99 USD


Zero 14.jpeg

Other than the IEM, these are included:
- 3 pairs of wide-bore silicone eartips (S/M/L)
- 3 pairs of narrow-bore silicone eartips (S/M/L)
- Cable

This is a pretty bare-bones accessory line-up, but is par for the course for an ultra-budget pair.

Zero 10.jpeg

While no foam tips are included, we have 2 types of silicone ones. The set on the left are narrower in bore size, and are stiffer to the touch. These increase bass though with some compression in staging. We have another set (on the right) that are wider-bore, which increases air and treble; these are less stiff too.

Zero 11.jpeg

The stock cable is a 2-pin oxygen-free copper silver-plated cable. It has a chin cinch, but lies on the thinner side and is somewhat tangly, with a smattering of microphonics noted. Not the most haptic-friendly, but serviceable for an ultra-budget pair. No biggie swapping out for an aftermarket cable should you wish to do so.

No case/pouch is included, but once again, this is expected for the retail price.

The rest of this review was done with the stock cable and stock wide-bore silicone tips. No aftermarket accessories were used, so as not to add any confounders to the sound.


Zero 4.jpeg

Like its predecessor, the Zero 2 has acrylic housings with metal faceplates. When placing an order, one can opt for a silver, orange or blue hued version.

Zero 5.jpeg

While the inner aspects are smooth without protrusions, the shell itself has perpendicular edges, which may be an issue for some; this was a similar complaint of the original version. Nevertheless, the shells are light, and are not fatiguing from a weight point of view.

Zero 6.jpeg

2-pin housings are always welcome in my book, as budget MMCX tends to be not so robust with frequent cable swaps.

Being a vented IEM, isolation is average. Nevertheless, the Zero 2 is very useable for outdoors still. I did not find any driver flex on my pair.


I tested the Zero 2 with the following sources:
- Apple dongle
- Cayin RU7
- Fiio K11 DAC/amp
- Fiio KA13 dongle
- Hiby R3 Pro Saber 2022 DAP
- Khadas Tone Board -> Schiit Asgard 3 amp
- Questyle M15 DAC/AMP dongle
- Sony Walkman NW A-55 DAP (Walkman One WM1Z Plus v2 Mod)
- Sony Walkman NW A-55 DAP (Walkman One Neutral Mod)
- Sony Walkman NW WM1A DAP (Walkman One WM1Z Plus v2 Mod)
- Smartphone

This IEM is moderate easy to drive, though amplification assists in scalability (in terms of bass tightness and dynamics).


Salnotes Zero 2.jpg

Graph of the Zero 2 via IEC711 coupler. 8 kHz is a coupler artefact peak.

Tonally, the Zero 2 can be described as having a warm neutral signature, which is pleasant and smooth.

It is sub-bass focused, with solid sub-bass reverberation and extension. Bass is north of neutral but not at true basshead levels. In terms of quality, texturing is decent, with a nimble speed and just a slight pinch of mid-bass bleed.

The lower midrange is a tinge recessed, but not overly so. This area is hefty and lush, aided by the aforementioned slight mid-bass bleed. With just a 6 dB ear gain, the upper mids are sedate without shoutiness. Vocals are forwards without being piercing, and those sensitive to shout will be very at home here.

The Zero 2's lower treble continues on from the slight upper mids hump, but thereafter the upper treble has a roll-off - as a result, there is minimal sibilance. Treble-sensitive peeps will like this tuning choice, though perhaps trebleheads might want to stick to the original Zero 2.

Timbral accuracy is excellent, acoustic instruments and vocals are very authentically portrayed; this is one of the highlights of the Zero 2.

I would class this IEM as having above average technicalities for a $20ish single DD. Soundstage and instrument separation is above average. Micro-details are decent. Imaging is very well done for the coin. While many budget CHIFI like to boost the treble to provide an illusion of resolution, the Zero 2's resolution is still laudable without needing to resort to this party trick.


Comparisons were made with other $20ish single DDs. Pure BA, hybrids and planars were left out of the comparisons as the different driver types have their pros and cons.

Zero 7.jpeg

Salnotes Zero (Original)

Salnotes Zero 2 and OG.jpg
Graphs of the Salnotes Zero versus Zero 2 via IEC711 coupler. 8 kHz is a coupler peak.

The original Zero uses a different driver (metal composite diaphragm), and is neutral bright, with about 3 dB less bass, but more treble extension than the Zero 2. The original Zero has a thinner note weight and a more metallic timbre. The original Zero has a cleaner bass, but displays more sibilance, and may be more fatiguing for treble-sensitive folk.

Technically, the original Zero has better micro-details and imaging, but a less expansive soundstage.

The original Zero is more analytical sounding, and is an option for critical listening and for folks who want a more neutral and resolving set. The younger sibling is more suited for those yearning for a lusher and warmer single DD, which retains decent technicalities but is more smooth and "fun" sounding.

Tangzu Wan'er

Salnotes Zero 2 versus Waner.jpg

Graphs of the Salnotes Zero 2 versus Tangzu Waner via IEC711 coupler. 8 kHz is a coupler peak.

Both sets are warm neutral, though the Waner has less sub-bass. The Waner is also less clean and tight in the bass, with a more marked mid-bass bleed.

Both IEMs are solid in timbre, though the Waner is behind in technicalities, with inferior soundstaging, micro-detailing and imaging.

Tanchjim One

Salnotes Zero 2 versus Tanchjim One.jpg

Graphs of the Salnotes Zero 2 versus Tanchjim One via IEC711 coupler. 8 kHz is a coupler peak.

The Tanchjim One is a bullet-shaped single DD. There is a DSP version and a non-DSP one; we will be comparing the non-DSP variant to keep it as an apples to apples comparison.

The Tanchjim One has less sub-bass, but is brighter, with a thinner note weight. Timbre is slightly more artificial on the Tanchjim One.

The Tanchjim One has a smaller soundstage, with worse instrument separation. However, it has better micro-detailing and imaging. The Tanchjim One can get hot in the lower treble for those sensitive to this area, and it also has driver flex, which may be a deal breaker for some.


Zero 1.jpeg

One of the hardest things, is to release a sequel to a legendary IEM. We have seen brands like Moondrop try to twang on pangs of nostalgia by releasing a sequel to a popular original model, trying to ride on reputation but to meh results. If too much of the tuning is changed, then consumers will ask why is it called a Mark II, while if the tuning is too similar, then they will ask where is the value-add?

The Zero 2 does something different from the highly lauded original, yet still retaining some of its roots. It furnishes a warmer tone, with improved bass quantity and extension, coupled with a richer note weight. Sibilance and treble-fatigue - some of the complaints of the original - are also addressed here, with a smoother top-end. Additionally, the Zero 2 has a more organic timbre, though there is admittedly some loss of resolution.

The Zero 2 is quite easy to drive, though amplification may improve sonics, and it has good build and lovely timbre. Similar to the original, the shells may be a bit "pokey" due to the perpendicular edges, and perhaps trebleheads may need to look elsewhere.

Like the original, the Zero 2 boasts of exemplary price-to-performance ratio - it brings a different flavour to the table to differentiate itself from the predecessor. For those new to the hobby, or for ones looking for affordable everyday carries/beater sets, the Zero siblings are very suitable options, depending on your sonic preferences.
Last edited: