LETSHUOER DZ4

Three dynamic drivers + single passive radiator in-ear monitor HIFI earphones.
Four-way Acoustic Tubes, Two-way Crossover Circuit.
Semi Open Faceplate Design, A Fusion of Metal and Resin.
The drivers are connected to the dual-pin receptacle via a flexible printed circuit (FPC) crossover board.
Joint Effort With HeyGear, The Leading 3D-Printing Supplier
Four cores of 216-strands, 0.05mm in diameter silver plated copper cable.
DZ4 comes with a standard 3.5mm single-ended plug, featuring a standard 0.78mm dual-pin design.
High precision in 3D Printed chassis production to meet ergonomic principles.
CNC-milled anodized aluminum casing with semi-open design.
Its outstanding sound performance brings exceptional adaptability and compatibility, catering to various usage scenarios from music reproduction, gaming, to basic monitoring needs.

Packaging and accessories:
Earphones
Carrying case
Two types of ear tips in three sizes each
Silver-plated copper cable
3.5mm single-ended plug
Warranty card and instruction manual

Specifications:
Sensitivity: 104dB
Frequency response: 20Hz - 40kHz
Impedance: 12 ohm
Chassis material: 3D printed resin
Cable: 1.2m silver-plated copper
Drivers: triple 5mm titanium dome DD + 6mm PR (passive radiator)

The DZ4 is a truly unique configuration. The packaging is beautifully simple. Inside is all the great accessories included. The DZ4 themselves are light and comfortable. They are a sturdy 3D printed shell and I really like the look as well. The case is very sturdy but on the smaller side, still it works good enough. The cable is both pretty and well made, it also comes with tips of good quality.

Sound:
Bass: presents neutral with a little Sub-Bass boost but tastefully so. Bass in general is more quality than Basshead. The speed and details are excellent but is a little less in texture than the average Harman.

Mids: midrange shows off the DZ4s neutral tuning mids sound fantastic and have a nice natural sound with plenty of energy and details. vocals are forward and female vocals sound a little better in my opinion.

Treble: The highs have air and sparkle without harshness and over extension, good energy and details in general things sound crisp.

Soundstage: Is accurate and open but the Width is much more impressive than depth. Still, it doesn't suffer on busy recordings.

Afterthoughts: The DZ4 offers an exceptional value for someone looking for a neutral IEM with good quality Bass, Mids, Stage and non-offensive treble.

Disclaimer:​

I appreciate Letshuoer for sending me a review sample of their Letshuoer DZ4!
However, the review will remain unbiased and entirely honest.
I do not consider myself to be an audiophile; rather, I am just a guy who enjoys trying out various IEMs and DACs and listens to music frequently.
Consequently, I will not review it using a lot of technical terms, but I will try to describe them as best I can.
Being my first product from this company, I will not be able to compare it with their other products.

Letshuoer DZ4 Tech Specs:​

• 3 x 6mm titanium dome dynamic drivers + 6 mm single passive radiator in-ear monitor HIFI earphones.
• Four-way Acoustic Tubes, Two-way Crossover Circuit.
• Semi Open Faceplate Design, A Fusion Of Metal And Resin.
• The drivers are connected to the dual-pin receptacle via a flexible printed circuit (FPC) crossover board.
• Joint Effort With HeyGear, The Leading 3D-Printing Supplier
• Four cores of 216-strands, 0.05mm in diameter silver plated copper cable
• DZ4 comes with a standard 3.5mm single-ended plug, featuring a standard 0.78mm dual-pin design.
• High precision in 3D-printed chassis production to meet ergonomic principles.
• CNC-milled anodized aluminum casing with semi-open design.
• Its outstanding sound performance brings exceptional adaptability and compatibility, catering to various usage scenarios from music reproduction, gaming, to basic monitoring needs.

Letshuoer DZ4 Packaging:​

For its price range, the DZ4 has one of the most complete packaging.
High-quality packaging has been used. White cardboard with a front graphic that is slightly embossed. Finding such a complete and well-made package makes me happy every time, especially in entry level iems! It has a great cable and, more importantly, very good tips, just like the Kbear 07 tips, which are my favorites.






However, I don’t think it’s important for the packaging to be expensive; instead, I think the focus should be on the product’s quality.

• Hard carrying case
• High-quality Cable
• 6 pairs of tips (Similar to Kbear 07)
• Manual and warranty

Letshuoer DZ4 Design/Build quality:​

The shell was made in collaboration with HeyGears, a leading 3D printing company. The build quality is definitely excellent, and the resin and metal fusion are absolutely perfect. To the touch, the resin shell feels satiny. The nozzle is a bit big and integrates two dampers. No ventilation holes are visible in the shell, but the back, where we find the CNC faceplate and the orange grille, is semi-open (which I deduce allows the passive radiator to work). Internally, from the photos that appeared on the web, the construction is excellent and clean; we see 3 drivers connected by a crossover via a flexible printed circuit, and all the drivers are separated with acoustic tubes.

Cable details
After being worn, the comfort is superb. Even after hours of consecutive listening, no pain is felt. Choosing a matte finish helps keep fingerprints off the shells.

Initial sound impression:​

Right from the start, the sound is different from the mass of IEMs on the market. Being unfamiliar with it, one feels a little out of place. The sound is bright but never sibilant, W-shaped but oddly mid-centric. The voices seem to be in the foreground. The bass is very track-dependent, and even the perceived quality seems very genre-dependent. Tracks that are too complex seem not to be the favorites of this IEM. Being the first impression, I do not express myself regarding the functioning of the passive radiator.

Equipment used for testing above:​

Device:

• iMac
• Redmi Note 7 (MIUI-based)

Software:

• Foobar2000 24bit 192khz (iMac)
• Amazon music UHD 24bit 96khz (Both)

DAC:

• F.audio KS01 (ESS)
• EPZ TP20 3.5 mm (Dual Cirrus)
• Hidizs XO (Dual ESS)
• EPZ TP30 (Dual ESS)
• Less DA1 (AK4493)

Letshuoer DZ4 Final sound impression:​

My ears too need some burn-in time before moving on to final impressions. I stayed with them for a few more weeks so I could figure out how they sound.

I’m not listing all the tracks because they’re too many, but with Billie Eilish’s albums, this set sounds spectacular.



I have listened to Jazz, RAP, R&B, Pop, EDM, and Chill music, and I think it is also the most suitable for DZ4.

It took me longer than expected to understand them. This is the first set where I don’t change the stock tips because they are exactly the ones I would have used.

Its sound and tonality have a neutral tendency; it is focused on the voices that always come first compared to the rest, or at least in 90% of the songs. Bass and sub-bass remain a mystery, and I would confidently state that it totally depends on the track you are listening to. Its soundstage is intimate but has a certain three-dimensionality to what you hear. It’s not a concert hall effect, but you can distinctly hear the individual drivers working on different frequencies, giving the sensation that the sound comes from several points, even if all at different depths. What I seem to hear is a sound that develops in height and depth. For example, in Billie Bossa Nova’s song, there is clearly a 3D effect, while in Billie Eilish’s Your Power, the guitar lacks musicality at the beginning but in other songs is completely fine.

I find them very detailed, but on some tracks they seem less coherent. But I have to say that they sound good, unlike many others.

Bass​

Personally, I really enjoy the bass; it’s punchy and tight, and the vibration or impact in the ear canal is definitely audible. Maybe the passive radiator helps, although it is impossible to say for sure, but the quality of the low frequencies makes me think so. The sub-bass is emphasized, and for a 6mm driver, it sounds really amazing but sometimes seems to be slightly thin.

Mids​

The mid-frequency region is excellent! I would say that this set’s strongest point is the midrange, with remarkable accuracy, transparency, and engagement. Voices are consistently audible, smooth, and focused. However, female voices are definitely better than male ones. I can feel the air in his midsection.

Treble​

The high frequencies are well refined and detailed; they are not tiring, but compared to the mids, they take a back seat. However, they are excellent even if the general tone is a bit strange, but perhaps it would be better to say something different! On some somewhat complex tracks, when turning up the volume, you start to feel a little tired, for my taste.

Soundstage and Imaging​

In comparison with other IEMS, the soundstage is really narrow; it develops more in height and depth but remaining on the sides, without wrapping you entirely.. It’s an IEM that depends a lot on the playing track but also on the genre you are listening to. The image is definitely accurate, it is slightly above average! You can clearly separate the instruments, even in more complex tracks. I sometimes have a three-dimensional feeling probably due to the excellent driver separation. it is a decidedly strange sensation, difficult to describe.

Comparison:​

vs Whizzer HE10



Two completely different souls the Whizzer HE10 is definitely warmer and more relaxed sounding. At their convenience, they are both very comfortable, but the nozzle and shell of the HE10 make them one of the most comfortable. Its warm, relaxed note doesn’t compromise on quality or detail, and it remains one of my favorites. If you are afraid of high frequencies, these are some of the smoothest on the market.

vs Hidizs MS3



Right now, my favorite is the Hidizs MS3. There is extraordinary detail here throughout the frequencies. Micro-details abound in the highs. It is an IEM with a lot of energy and a price that is unquestionably appealing, but it costs twice as much as the Letshourer. Read my Hidizs MS3 review on Head-Fi if you are interested.

Conclusion:​

It is unusual to hear something with a different tuning, and I personally enjoy hearing the Letshuoer DZ4. The choice of 3 small titanium drivers and a passive radiator has resulted in something that stands out from the crowd. I can’t say for sure that this passive radiator is a game changer as it doesn’t have extreme bass, but the sub-bass is felt as well as the vibration in the ear canal. Obviously, they may sound strange to many, but at the same time, they appeal to just as many people. Personally, I advise using them with a DAC that has a warm sound, such as the EPZ TP20, to enhance the low frequencies.

So I recommend them to anyone looking for a headset that emphasizes the voices and, above all, to those looking for something different.

More information & Where to buy (no ref link):​

• LETSHUOER Official Site
• Aliexpress Official store
• Amazon UK
• Amazon USA

I’ve been quite a fan of LETSHUOER’s recent releases such as the S12 and Cadenza 12. They’ve had a harder time IMO breaking into the ~$100 price bracket. They had the D13 which I wasn’t a fan of and the ~$100 and under price point has quite the competition already. They would need to come out with something that was unique if they wanted to stand out in the crowd IMO. They definitely came out with something different for the entry level IEM bracket. The DZ4 is using 3 dynamic drivers and a passive radiator setup. It comes in at $89.

Quick shoutout to LETSHUOER for sending the DZ4 to check out and review. While I always appreciate the chance to test and review products sent in from manufacturers or dealers, it never affects the rating of my reviews.

The LETSHUOER DZ4 can be pickup below:
https://letshuoer.net/products/letshuoer-dz4-triple-dynamic-drivers-single-passive-radiator-edc-hifi-in-ear-monitor

Onto the review of the LETSHUOER DZ4! My personal preference is a hybrid/tribrid IEM where I get good hitting bass and have a detailed treble with decent mids. When it comes to an over ear headphone I prefer a spacious sound with a deep low end, the mids to be more forward and the highs to be a little bright with some sparkle. I listen to a lot of genres but I hover in the classic rock, blues and edm music with some rap here and there.

Gear Used​

IPhone 14 Pro Max with headphone adapter, Hiby R6 PRO II, Moondrop MoonRiver 2 Ti, Moondrop Aria, Truthear HEXA and Everolo Z8/SMSL SP400 stack

Looks and fit​

The DZ4 shell has a different design compared to the rest of the LETSHOUER lineup. It has a beige “hearing aid” like color that is softer on the shell. I like the way this feels against my ear and it makes for a comfortable experience on longer listening sessions. The faceplate has a close matching silver-beige color and an orange design that is vented. The vented design on the faceplate does make this an semi-open IEM design. I like the comfort and fit of the DZ4.

Isolation and sound leakage​

The DZ4 does passive isolation pretty well. It does however leak more sound than other hybrid designs. It seems that semi open faceplate probably helps with the passive radiator which has the benefit of a better isolated seal for the user but the trade off is a lot more sound leakage in quiet areas. I wouldn’t use this at normal or higher listening volumes in quiet areas.

Packaging and accessories​

The DZ4 comes in a nice and average size box. When you open the box up, it has the IEMs in some foam, under that is the set of tips on top of a circle style case. The tips come in small bore and large bore sets of 3 sizes. I think this works well as the DZ4 does benefit from tip rolling. The case is a screw on type so it does require a second or two to unscrew which is fine. A more secure case but I still really like their magnet style case from their more expensive offerings.

Sound(overall)​

These final impressions were done off the Eversolo DAC-Z8 connected to the SMSL SP400. These impressions are what the DZ4 sounded like to my ears. This was also using the Spinfit CP100+ tips. Things like ear tip selection and DAC/amp selection will produce different results and impressions vs what my ears hear on my specific gear.

The Dz4 has a neutral tuning which is surprising given the 3 dynamic drivers. I was expecting fun bass cannons but instead I was decently surprised and given a very balanced tuning instead. The Bass does have some decent slam/impact. The mid bass is full but it doesn’t have much weight to the bass notes. It just sounds neutral to my ears. The mids and vocals are nice and relaxed. They don’t sound super fast or artificial. They also don’t have any sweetness or warmth so we get a really neutral sound here. The vocals IMO could use a little extra energy since they blend in with the background instruments more than I personally like. The upper mids are really balanced here but I would say they do lean into a neutral-bright sound which gives a little needed energy to notes. The treble is really tame and it doesn’t sound metallic or lacking in sharpness. Once again, neutral. I would say the treble does trail off pretty quickly which makes sense for the dynamic drivers used. I tend to only like neutral and safe tunings in really high end IEMs but I do like the sound the DZ4 produces. It does feel like it could use a little energy either in lows or highs to make it sound unique but I think it’s fine given that it doesn’t sound bad at anything, it just doesn’t sound fantastic at anything either.

Soundstage/Imaging​

The staging is a little strange here. With my preferred tips, I get a wall of sound type of staging. The depth isn’t very good but I do get fantastic width and a little reverse imaging which does make it sound a little different. The imaging is very good which makes sense given how safe the tuning is.

Sensitivity/Drivability​

The DZ4 is very easy to drive and it doesn’t scale much with higher end gear so I think almost anything modern in the last few years will work well with the DZ4. Some super high volume output amps might be too much for the DZ4 and if you have bad channel imbalance at lower volumes, the DZ4 will possibly not be a good pairing with those specific amps. I also had zero floor noise issues with any of my current gear when run balanced.

Stock cable​

The stock cable looks a lot like the ones they include with the standard S12. I like the braid and cable material is a little thicker which I prefer. This makes for a really high quality feel. I also find it light enough to be comfortable when listening for longer sessions. I wouldn’t swap the cable unless you really wanted to run it balanced.

IEM comparisons​

Moondrop Aria​

The Aria is my favorite under $100 IEM. Does the DZ4 dethrone it? No, it's just a good alternate option to the Aria IMO. I would still pick the Aria for a more exciting listen with the drawbacks being I might run into some sibilance on some music. The DZ4 is just a safer listen for pretty much all genres. The Bass impact is stronger on the Aria and the mids are a little sharper as well. The DZ4 has a more balanced lows and mids and I find the vocals are a little more natural sounding on the DZ4. The Aria has a little more energy in the vocals however which makes them pop. The upper mids are much stronger on the Aria which will result in sibilance issues on some genres. The DZ4 never has this problem which can make them boring at times. The treble is tame on both but the Aria is still sharper but a little more metallic sounding. Both pull in good details given the price. Staging is a little more balanced on the Aria vs the wall of sound I get from the DZ4. Both are great. Aria is more fun and risky. DZ4 will play it safe and be more enjoyable.

Truthear Hexa​

The Hexy is another neutral tuned IEM and is a little more traditional with DD and BA drivers. Bass is stronger on the Hexa but the bass sounds a little more natural on the DZ4. The mids are a little more artificial on the Hexa where they sound a little more realistic on the DZ4. The vocals sound great on both with Hexa still sounding just a bit more artificial. The upper mids have a little more of a noticeable boost on the Hexa over the DZ4 but I prefer the Hexa here. The treble is way more sharp and brighter on the Hexa. The downside is that it also sounds somewhat splashy and not as refined. That being said, both are super neutral sounding in the treble, this in no way suggests the Hexa has a strong treble because it doesn’t compared to other IEMs. Both have about average staging but the Hexa has a more balanced soundstage. The DZ4 has a more pronounced wide but short depth to its soundstage. Both are good in my book.

Amping Combinations​

Moondrop Moonriver 2 Ti​

The DZ4 is a really nice neutral sounding set of lower cost IEMs. This is also a pairing I like with the MR2 Ti. The bass does sound like it has a little extra warmth and adds to the already decent bass performance. Mids and vocals sound accurate but they still sound a little on the sweet/warm side. The treble is about the same as other source gear and it performed the same to my ears. The staging was average(but wide) and imaging was spot on. A good pairing but it doesn’t have much of a sound effect from the small changes as some other IEMs I tested.

Eversolo DAC-Z8/SMSL SP400​

This combo is what I use to review all my current audio gear with. I found the DZ4 did sound a little more lively from my desktop stack. This might be due to the more powerful amp playing well with the 3 DD setup in the DZ4. I however got the same or close to the same results from my DAP as well. So I think an entry level DAC/amp will be good enough.

Overall thoughts​

I do like the DZ4 and I’m interested to see what they can do with this design if they pursue it going forward. A Semi-open design is always neat, even if it’s not quite a traditional semi-open setup. I don’t normally like safe tunings for entry level since it doesn’t normally do anything special. This is still the case for me. I don’t think the tuning is anything special but I do like the way it sounds and I have no issues with the DZ4 that I can think of. My preference for something unique in the ~$100 price range is just a preference and the DZ4 does perform well overall. As such! The DZ4 is an easy recommendation for those hunting a safe yet well balanced neutral tuning. LETSHUOER is willing to think outside the box and try new designs with their IEMs and I really like that mindset. I can’t wait to see what they come out with next! Thanks for reading!!!