KZ - Zsr

KZ ZSR Review: Balancing Your Budget
KZ is a budget IEM brand based in China. Their aggressively valued products are often viewed as a staple of the Chi-Fi market, and as such, are fairly well known. While I’ve had my disagreements with choices they’ve made stylistically in the past, they seem to have differentiated themselves enough from their competitors for me to set aside my qualms. So, without further ado, here’s my thoughts on the ZSR!

You can find the ZSR for sale here, on AliExpress, for about $30! There’s a multitude of color options, as well as the option to add on a microphone. My version does not come with one.

About My Preferences: Heads up, I’m a person! As such, these words are my opinion, and they are tinged by my personal preferences. While I try to mitigate this as much as possible during my review process, I’d be lying if I said my biases are completely erased. So for you, my readers, keep this in mind:

• My ideal sound signature would be an extended sub-bass with a leveled, but textured, mid-bass.
• I have a mild treble sensitivity.

Source: The ZSR was powered like so:

HTC U11 -> USB-C adapter -> earphones

or

Hidizs AP100 3.5mm out -> FiiO A5 3.5mm out -> earphones

or

HiFiMAN SuperMini -> earphones

or

PC optical out -> HiFiMe SPDIF 9018 Sabre DAC 3.5mm out -> earphones

All music was served as MP3 @320Kbps or as FLAC.

Tech Specs

• Sensitivity: 107dB
• Resistance: 22Ω
• Connectors: 3.5mm, 2-pin (0.78mm)

Sound Signature
Sonic Overview:

The ZSR is a V-shaped IEM. It makes use of both an elevated mid-bass and treble, though the treble is notably more prominent. The midrange is recessed but doesn’t take on a soft tonality that is often a result of such a tuning. Sub-bass is about 2dB less prominent than the mid-bass.

Treble: Songs used: In One Ear, Midnight City, Outlands, Satisfy, Little One

Treble is boosted by a considerable degree. This is an artifact of both the deliberate decisions made by KZ when they tuned the ZSR and a natural result of using the two BA drivers that they chose. Thankfully this boosting doesn’t do too much damage to cohesion. There are no blatant disconnects in the sound, nor are there particularly offensive peaks.

The ZSR’s treble retrieval in the treble is pretty substantial, especially for an IEM of this price point. It easily beats out my previous “under $40" staples in this regard. Furthermore, it does so without causing too much distortion or blurring in any particular set of frequencies.

Treble tonality is good, relative to its peers at this price. High-hats and cymbals sound distinct at all but the busiest parts of a song. Extension is very impressive as well, as there isn’t a noticeable degree of treble roll-off.

Sibilance is only a minor concern with the ZSR. The vast majority of my songs were easy to listen to, even at higher volumes. Satisfy didn’t fair too well though. The ZSR errs on the side of faithfulness to the recording, so take that in what way you will.

Midrange: Songs used: Flagpole Sitta, Jacked Up, I Am The Highway, Dreams, Too Close, Little Black Submarines, Do You Really Like Being Alone

The midrange arguably the strongest point of the ZSR. While it is recessed, it remains so while maintaining sonic integrity to a degree I can’t say I’ve heard many other IEMs reach at this price.

Instrumentals are a blast to listen to. The weighting of acoustic guitars is as satisfying as the crunch that accompanies electric ones. Strings and drums sound equally as good. Following from these traits is a very cohesive and pleasing tonal profile for acoustic instruments in the midrange.

Vocal intelligibility is above average, even when compared to more expensive IEMs. A small spike in the 1–2KHz range is responsible for that, as well as an accompanying spike from 4–5KHz. The ZSR favors male vocals though, not quite hitting that level of “sweetness” that I prefer in my female vocals.

Bass: Songs used: Moth, Gold Dust, In For The Kill (Skream Remix), War Pigs (Celldweller Remix)

The ZSR’s bass is not meant for “bassheads”. It’s meant for listeners who want a semi-visceral experience from the lower register but still demand sonic integrity from the rest of the sound spectrum. As such, the mid-bass hump is emphasized, but not to the point of being aggressive. The ZSR’s single dynamic driver does a good job balancing bass volume and bass quality, only failing to deliver good low-end performance in the most demanding of songs like In For The Kill.

All things considered, I still had lots of fun listening to my bassy songs through the ZSR, and all my drops were still punchy and weighted well. Just don’t expect your skull to shake once the bass drops.

Packaging / Unboxing
Build
Construction Quality

The ZSR looks like polished black stones. “Left” and “Right” are printed stylishly on the shells denoting which side they should be used on. The finish is good and doesn’t seem like it will come off any time soon.

On the top of the shells, we’re greeted with recessed 2-pin connectors. The recession is clean and the connectors are firm. No complaints here.

The cable is of standard stock. It gets the job done and isn’t in any immediate risk of failure. It is made from twisted red and white inner strands coated with a translucent grey rubberized layer. There is some friction across the surface, but not enough to get caught on the edges of your clothes. Microphonics are about as negligible as one can really ask.

The ZSR’s cable is terminated with a 3.5mm jack, and like the rest of the cable’s components, it is housed in a matte black plastic. The stress relief is adequate.

Comfort

As with all earphones, your comfort will vary according to your body’s unique aural anatomy. So while these are my impressions, there is a change that you may come to a different conclusion.

I had no problems wearing the ZSR for any duration. Whether it was during a bike ride for an hour or at work for three, I had no problems with the ZSR, even while using the eartips that came in the box.

It also features memory wire ear-hooks which definitely help keep it on my ears while I’m moving around.

Accessories
Inside the box you’ll find:

• 2x pairs extra silicone eartips.

The sparse offerings of the ZSR accessory wise would be pretty disappointing if it weren’t for the already-aggressive pricing of the device. The build is better than average for its price point, as is the sound. The corner had to be cut somewhere, and it appears that was with eartip offerings/cases. That’s fine by me though, since a good pair of eartips is quite literally $2, and a makeshift case can be fashioned from basic household materials if you are trying to be that frugal.

Comparisons
1: Brainwavz S0 ($50)

The S0 and the ZSR trade blows. While the ZSR offers much more detail retrieval in the upper-midrange and treble, the S0 counters with a more cohesive sound signature. The S0 is more sturdy, but that comes at an addition $20 in price. Furthermore, the S0 features a larger mid-bass hump than the ZSR and has a warmer midrange which really makes it a separate beast altogether, at least on a sound-signature level.

2: Alpha and Delta D3 (~$35)

The D3 feels like a more extremely tuned version of the ZSR. The ZSR’s midrange is noticeably more expressive, and offers more treble extension. The D3 touts a powerful and dynamic bass response that coexists well with its lower midrange. It also boasts class-leading construction, though it does cost more as a result.

Summary
The KZ ZSR, like many of its siblings, offers a very good price-to-performance ratio. It forsakes having a wide variety of often redundant eartips to eek out as much sonic fidelity as it could, and such a bet pays off. While it doesn’t offer the refinement you can get at higher price points, for $30 you’d be hard-pressed to find an IEM that offers a better overall value.

As always, happy listening!

Ever since I purchased my first set of Rose Red ZS6's, every other IEM in my collection has been ostensibly relegated to fly coach. I should probably refrain from uttering statements of this severity but.... nonetheless, there it is. When the Knowledge Zenith ZS6 reached my doorstep, my attention remained undivided.

Acoustically, I feel like the guy who "WAS" a serial dater, but when the ZS6 arrived I was suddenly ready to commit. It's combination of micro-details, vivid midrange and clean deep bass have seduced me to no end. So much so that I've started a small collection of the original release colors (rose red, emerald green & obsidian black) in their original iteration.

The question then becomes "what possible virtues could the ZSR have that would lure me from my beloved ZS6?"



Well, George at GearBest provided me with a ZSR sample for review purposes so we'll take a long hard listen and see if the ZSR can hold it's own, against not only the esteemed ZS6, but also the growing sea of sub-$30 Chi-Fi IEMs.

Since we're on the subject, a huge thanks to George for providing the sample.

Full disclosure: I've no affiliation with GearBest and receive no remuneration for the review other than retaining the review sample.

You should also know upfront that I own and enjoy each of KZ's hybrid IEMs (ZST, ES3 & ZS6) and I have no issue with the treble present in any of the three models. I mention this because those of you who are sensitive to forward treble would be wise to keep in mind my preferences and properly absorb this review through the filter of your own preferences.

About me:

About IEMs:

The Knowledge Zenith ZSR:


Hot on the heels of Knowledge Zenith's extraordinary "Bang-for-buck" quad-driver ZS6 is the new 2BA+1DD (per ear) ZSR. When you first set eyes upon the ZSR you may just mistake it for being a variation of KZ's most comfortable model yet, the ZS3. Under closer inspection though, you'll find there is quite a difference between the two IEMs.

The ZS3 housing is more compact than the ZSR housing. In particular, the ZSR dome-like faceplate offers quite a bit more space under the hood and the nozzles, which have no lip, are some of the largest I have seen on an IEM.

The 6mm nozzles may have difficulty accommodating eartips with relatively narrow collars but interestingly enough I found tip-rolling to offer some subtle changes to the overall presentation. The eartips from my BVGP DM5 gave the ZSR a more diffuse presentation while my Rock Zircon eartips seem to offer more focus on the midrange and/or vocal presentation. Be sure to try different eartips at different insertion depths. You'll find a combination that suits your particular bent if you invest a little time in fine tuning things with your favorite eartips (wide-bore vs narrow-bore vs foam, etc). The included eartips are great but not everyone agrees about that, so.......

KZ was one of the first Chi-Fi manufacturers in the sub-$20 price bracket to offer it's IEMs with detachable cables and the ZSR at it's sub-$30 price point is no exception. The cable is connected to the earpiece via a 0.75mm 2-pin connection. Of course the benefit of detachable cables is that when the cable fails (and over time it will) you can simply replace the cable and extend your IEMs useful life. Though it's not necessary for you to follow suit, every KZ in-ear monitor set that I own (that offers detachable cables) has an upgraded cable connected to it, mostly for aesthetics and comfort.


Be aware that the days of KZ's well made shield-shaped cases with fitted foam cutouts for the earpieces are long gone. It's a sparse and barebones affair nowadays. You get small, medium and large eartips with KZ's basic but durable detachable cable. My $12 KZ ED9's and ED10's were packaged with pride which conveyed a sense of quality in the product, but KZ has abandoned this practice. They were able to do it at $12, but I suppose it's just impossible to do now that prices and profits have.......increased(?)

At any rate, the ZSR is KZ's first 3-Driver hybrid IEM featuring one 10mm dynamic driver for lower frequencies, one treble focused balanced armature and one midrange focused balanced armature. To my eyes, the ZSR took it's inspiration from the iBasso IT03 design with it's semi-custom moulding which fits perfectly in the concha of my ear and while the ZSR may not seal the ear canal as well as the ZS3 does it certainly provides a satisfactory seal for my ears.

Comfort:


The most comfortable fitting IEM in my collection is the KZ ZS3. The ZSR comes in a close second and once I fitted them with my silicone earhooks the ZSR simply doesn't budge. Looking at those faceplates and considering the fact that I have shallow ear canals you would think that discomfort is a foregone conclusion, but you'd be wrong. Well.....at least I was wrong. I fell asleep for approximately 6+ hours on two occasions with them in and suffered no discomfort. I was actually surprised that the bulbous faceplate didn't push the IEM further into my ear canals when my head hit the pillow.
Hmmm, that's a +1 for comfort.

Treble:
To my ears the ZSR treble is well judged. It is full of micro-detail and sparkle, but juuuust rolls off the edge in order to keep things from getting too hot. Like I said, well judged. While listening to The Cure's "Close to me" the lower-treble comes through clean and clear while the upper-treble comes through with just enough polish to make things vivid and transparent. But let's test a track that has enough action up top to draw your attention away from the rest of the track from time to time. Typically, I'd go with something from Michael Jackson's Thriller album, but let's do something a little different. Let's listen to Toni Braxton's "He wasn't man enough". On my ZS6 it is entirely necessary for me to lower the volume when testing this track. On the ZSR there was no need to lower the volume and those triangles still came through with just enough energy to keep things lively.

Hmmm, make that another +1 for comfort.

Midrange:
The ZSR's midrange seems to keep the theme of less is more. Vocals and strings have enough presence and weight to keep things fluid and alive with juuust a touch of restraint, avoiding any hint of strident behavior in the upper-midrange. A good track to test for a shouty upper-midrange is Louis' trumpet solos in Ella Fitzgerald & Louis Armstrong's "Gee Baby, Ain't I Good to You". It's great to hear the trumpet come through crystal clear without the harshness.

A lover'ly track for testing midrange timbre and weight is James Taylor's "Fire And Rain". Both the guitar and Taylor's voice come through beautifully vivid on the ZSR.


Bass/Sub-bass:
This is the one area where things can be a bit tricky. On my ZuneHD, which is power-efficient, the lower frequencies, while deep, seem to be limited in presentation and weight. However, playing the exact same track on my Fiio X3(i) the bass just kicks things into gear with a sobering amount of depth that is sorely absent on my ZuneHD. This can be a typical occurrence with multi-driver IEMs and is something one should consider if your main source is a smartphone or power-efficient DAP. If your device has a relatively high output impedance (greater than 2.0) then you may not get the best that the ZSR has to offer. On the other hand, if you own an Android-based DAP like a Fiio X5iii or something equivalent, listen to how clear and airy that treble and midrange is on the Nelly Furtado track, in spite of the copious amount of bass. Very impressive.

I will say that it was easy to recognize the omission of the additional 6mm driver found in the ZS6. There is a discernible absence in the definition of the mid-bass to upper-bass transition.


Soundstage/Imaging/Layering:

Listening to the ZSR and ZS6 back to back I can hear that the ZSR is not as adept at layering and has slightly less defined imaging, but I'd bet that this has more to do with sonic reflection due to the amount of space under the ZSR's dome-like faceplate. All those acoustics dancing about inside the ZSR's spacious housing would have a slight effect on diffusion and focus. That's conjecture on my part but it makes sense when you consider how much more open the ZSR is to KZ's own ES3 which shares two of the ZSR's drivers (10mm DD & 1BA). The upside to that dome-like faceplate is that the ZSR's soundstage is quite wide and deep, yet you can still pinpoint each and every instrument on the following tracks.



It could be said that the ZSR has a face that only a mother could love, but KZ seems to have correctly chosen to go with function over form, so I won't peep and mutter, though I'm tempted to do so. I've considered purchasing several sets of ZS3's to put their housings to use with other driver configurations, even though I know the compact form of the shells will likely result in a somewhat limited soundstage. Perhaps I should be looking at the ZSR as well.
If and when the flash-sales occur for tbe ZSR then I would be wise to take advantage of the opportunity because Knowledge Zenith has a bevy of new models that are soon to be released. Swapping and mix/matching drivers and shells could be a whole new thing for me in the near future and the fact that KZ's are so inexpensive makes it all possible.

In the meantime, how does the ZSR stack up against KZ's current flagship IEM, the ZS6?

To my ears the ZS6 and the ZSR are two separate tools on KZ's continuum.

The ZS6 is an IEM that you must be prepared for. The presentation is full-on from top to bottom and it's best to spend some time with the ZS6 to fully appreciate it's many virtues. The ZS6 is the equivalent of taking that low-slung high-octane sports car on your favorite stretch of winding back road (Pacific Coast Highway here in Northern California) and no matter how hard you try you just can't wipe that silly grin from your face.

The ZSR is an IEM that is altogether capable, but is more the silent strong type. It is the equivalent of taking a powerful luxury coupe for a cruise. Instead of competing with the athletic types, the ZSR just wafts you around in comfort with little fanfare or ceremony. It's a very capable IEM that focuses mainly on getting the job done and doing so in comfort.

"Nothing is overdone" might be a debatable statement for me to make depending on your sound signature preference, but very little is underrepresented. To some owners of the ZS6 the treble is a bit too much. I, on the other hand, really appreciate the ZS6's crisp micro-detail in the upper-treble. It appears that KZ has taken the treble concerns on the ZS6 to heart and have micromanaged the "hot" areas (upper-treble and upper-midrange) on the ZSR so the presentation is fluid, fatigue-free and coherent. In other words, for less than $30 the ZSR will breathe life into your music so you can enjoy your favorite tunes in supreme comfort. That's a winning combination as far as I am concerned and I find myself congratulating Knowledge Zenith on a job well done yet again.

At $28+/- the ZSR is a steal and given KZ's track record, that's no surprise.

Great job, KZ.....again!

The KZ ZSR is currently available at GearBest.com for $24.87.

https://m.gearbest.com/earbud-headphones/pp_1512917.html


*** UPDATE 6/5/18 ***

After spending some time with the ZSR I prefer using it with a DAP that leans toward a brighter presentation. I found that DAPs with a warmer presentation tend to slightly blur the lower-bass. A brighter DAP will keep the low end a bit cleaner.

Keep in mind that I am a micro-detail addict and I tend to seek out fatigue-free IEMs with as much micro-detail as possible so those of you that are treble-sensitive should pair the ZSR with a warmer leaning DAP.

I've said this before on the KZ Thread and my thoughts haven't changed. I think KZ should have employed the ZST's 8mm DD instead of the 10mm DD employed in the ZSR. KZ's 8mm dynamic driver with it's quicker response would grace the sound signature with more air while the lower frequencies would still retain sufficient depth and impact.

That said, the ZSR is a very good IEM, despite the missed opportunity for a bit more air in the presentation.

*** END UPDATE ***

Greetings,

Today we're checking out the ZSR, a new hybrid earphone from budget kings Knowledge Zenith (KZ).

Prior to 2016, KZ had not released a single earphone that was using anything other than dynamic drivers. That all changed with the ZST which brought hybrid tech to the masses at a truly affordable price, and it sounded pretty good too. Since the ZST, KZ has gone all out with hybrid models releasing the ZS5, ZS6, and ES3 along with the ZSR and other rumored models on the horizon.

The ZST and ES3 are 1+1 hybrids with one dynamic driver (DD) and one balanced armature (BA) per side. The ZS5 and ZS6 are 2+2 hybrids rolling with two DD and two BAs per side. The ZSR bridges that gap with two BAs and one DD per side. Is it just another hybrid, and just another KZ rolling with the same signature we've heard revised over and over in the ZS and ED series of earphones, or does it do anything different enough to warrant it's existence. Let's find out!

Disclaimer:

I purchased the ZSR from Gearbest for 24.62 CAD during one of their many, many flash sales. I'm not associated with Gearbest, or KZ, or any other entity meaning the thoughts within this review are my own. There was no financial incentive provided to write this review.

Below is a link to the ZSR on Gearbest but as with most KZs you can find them for sale all over the place including Penon Audio, AliExpress, and others: https://www.gearbest.com/earbud-headphones/pp_1512920.html

Edit: Changed score from 4.5 to 4 stars to reflect thoughts in comparison to the ZS10.

Source:

For at home use the ZSR was powered by a TEAC HA-501 desktop amp or straight out of my Asus FX53V laptop. For portable use it was paired with an LG G5, HiFi E.T. MA8, F.Audio S1, or Shanling M1, all of which brought it up to listening volume without any effort.

Personal Preferences:

I listen primarily to various EDM sub-genres (liquid drum and bass, breakbeat, drumstep, etc.), hip hop, and classic rock. While I enjoy a variety of signatures in my headphones I generally lean towards slightly warm with elevated treble and sub-bass, an even and natural mid-range response, with reduced mid-bass. The HiFiMan RE800, MacaW GT600s, and thinksound On2 offer examples of signatures I enjoy.

Specifications:

• Sensitivity: 107dB / mW
• Impedance: 22 ohm
• Frequency response: 10-40kHz

Packaging and Accessories:

Given their low price and in line with other KZ's you're not getting a ton of stuff for your dollar. The ZSR comes in the same shock-white packaging KZ has been using since moving away from the VSonic inspired boxes they were shipping with early ZST and ZS3 models. It is very clean and simple with a wire frame image of the earphone printed on the exterior sleeve. Side that off and the ear pieces are laid out under a transparent lid and set within a basic plastic tray embossed with the KZ logo.

Lift all that out and you find an instruction manual and some little plastic bags holding the spare ear tips and the removable 0.75mm 2-pin removable cable. In all you get;

• ZSR earphones
• 2-pin cable
• 3 pairs of single-flange silicone tips (s/m/l)

KZ gives you all you need to get going and nothing more. That said, I want to make note that they include their “Starline” tips which are one of my favourite tip options on the market. They're durable, comfortable, and seem to pair well with pretty much everything I throw at them. There's a reason I bought six extra sets back after I first tried them with the ZST.


Build, Comfort, and Isolation:

The ZSR, like the ZS3 before it, has a custom iem inspired design. Whereas the ZS3 which borrowed from StageDiver, the ZSR takes inspiration from iBasso's IT03, though looking closely they've got enough differences to be far from a 1:1 take on each other. Good thing they avoided Campfire Audio this time around or people would have really flipped their $#!&.

The plastics used feel dense and durable, at least as good as the ATR's plastics, and are wonderfully molded without any sloppy lines. The only negative I could find was that on my left ear piece, the two halves of the shell just don't line up quite as well as they should so on the back there's a teeny little ridge that sticks out a fraction of a mm. I doesn't touch my ear or cause any discomfort, but it's there and if you hunt for it, you'll find it. The right ear piece is flawless. While I normally like it when Left and Right indicators are the entire word printed in cursive, admittedly it just doesn't on the ZSR, at least on the version I have in black. I get a feeling it'll look best in the white model that's coming out....eventually...which I will be all over when they're on the market. Lastly, above the nozzle you find printed “ZSR Hybrid Technology”. Everything is printed cleanly and clearly, though I know it'll wipe off eventually.

The openings to the larger than normal nozzles (6mm in diameter) are protected by a very fine metal mesh. There is unfortunately no lip to hold tips on which combined with the massive opening is going to limit options for tip rolling.

The cable is typical KZ; slightly sticky and plenty flexible with good strain relief. It is also saddled with memory wire which I detest. At least KZ does memory wire right, using material that stays in the position you set it. All they need to start including now is a chin cinch and you're good as gold.

Despite the excessive size, the ZSR is actually quite comfortable, rivaling the ZS3 which I liked a lot more at first. The ZS3 sits deeper and more flush with my ear but there's a process to getting a good seal that requires twisting it to the right position. The ZSR slots right into place effortlessly though it doesn't quite disappear the same way the ZS3 does. The ZSR's improved consistency in fit is a big plus in it's favour. The only negative is that memory wire, which is why I swapped out to my original angled ZST cable which uses weights, ala. ATE/ATR instead of memory wire to keep the cable securely around wrapped your ear.

Despite ample ventilation (one vent for the DD and two more at the bottom rear) the ZSR isolates really well. I was quite pleased with how effectively it could block out the sound of vehicles driving by, people chatting next to me while I enjoyed a delicious “high quality” Tim Horton's coffee, and other obnoxious sounds. I'm sure if I bothered to take the time to fit some foam tips, they'd be even better.

In all the ZSR is fairly well constructed, the cable is going to be a “love it” or “hate it” type affair, and isolation is pretty impressive for something so well-ventilated. Comfort should also be good, just keep in mind both the housings and nozzles are larger than average so those with small ears/ear canals be warned.


Sound:

Tips: I really felt no need to move from the stock tips given I like them so much and feel they pair well, but alas, curiosity got the best of me. After swapping through the few tips I have on hand that would fit those beefy nozzles, I settled on those tips from the Auglamour RT-1 and haven't gone back. Not helpful, because I don't think you can buy those tips separately.

In my experience, KZ's hybrids have been mostly composed of a thinner presentation with dazzlingly prominent treble, a recessed or uneven mid-range, and elevated bass. The ZSR is similar to past hybrid offerings from the brand, though with a few much needed alterations. These, in my opinion, make them the most consistent hybrid in KZ's lineup.

The ZSR's treble is elevated, more so than the ZST but less than the ZS6, giving them an energetic and vibrant presentation. Like the ZST, it's peaks seem to roll off before they become overly aggressive or irritating as can be the case with the ZS6. Could just be me though, as I'm not particularly sensitive to treble. My only issue with the ZSR's treble lies with it being slightly loose and with a hint of splashiness, particularly evident with cymbals which lack definition. It's not significant enough to ruin the experience for me though, unlike on older KZ's where this quality was much more prominent.

The ZSR makes some significant steps forward with it's mid-range, bringing in some warmth and thickness lacking on other KZ hybrids. It's quite reminiscent of the classic ANV here actually, though not as prominent. While it is still slightly recessed compared to the treble and bass, it physically sits more forward (closer to action) in the overall presentation which does a good job of masking the minor recession. This is the best of KZ's hybrid bunch when it comes to vocal-centric music to my ears, sounding more natural with both male and female vocals. Instruments seem to have more weight and body to them as well which really helps out with guitars and other instruments.

The low end on the ZSR is reminiscent of the ZS3; slightly mid-bass focused and darkish with good depth and weight. There is a touch of bleed into the lower mids, though throwing on tips with a slightly wider bore negates that. It's more punchy and textured than what you get from the ZS5(v1) but not quite as good as the ZS6. The slightly softer presentation matches well with the detailed upper ranges and full-bodied mid-range, though, and really serves to tie the overall presentation together.

The ZSR's party piece is a round, wide, and deep sound stage that has an airiness to it I've not heard from a KZ since the ANV, nor many other earphones for that matter. They give you a true sense of space with effects skittering off into the distance. Listening to movies with these gives you a true sense of the scale they can portray and makes for a killer experience.


Select Comparisons:

(Volume matching completed via the Dayton Audio iMM-6)

KZ ZS6 (price varies wildly): The ZSR and ZS6 are equals in my opinion, but for different reasons. The ZSR has more low end presence, a larger sound stage, a more natural mid-range with additional warmth and thickness, and overall sounds more even and coherent. The ZS6's technical abilities are a step up with a more layered and well-separated sound with improved imaging accuracy, along with slightly better detail retrieval. The ZS6's low end is slightly more textured too, but it lacks the visceral punch of the ZSR. The ZS6 is also brighter. Not a problem for me, but this may pose issues for others if forums and the comments sections on youtube and Reddit are any indication.

The ZS6 is undoubtedly the better built of the two, looking and feeling much more premium with it's well-crafted aluminum shells. I actually find them equally comfortable, with the ZSR's ear-forming shape making it more conducive for use while active. That said, forming the ZS6's earguides properly keeps them securely in place, so it's almost a wash there too.

Audbos DB-02 (47.99 USD): The DB-02 is a 1+1 hybrid from Audbos, and an earphone you might better know under the brand name Magaosi. I personally find it's wood and aluminum, shallow fit ear pieces gorgeous to look at and extremely comfortable. I suspect they're probably going to sit well with more ears than the ZSR's massive shells. The DB-02's cable is pretty poor; thin, delicate, sticky. KZ's is a big step up imo.

The ZSR's treble is slightly more prominent and with greater extension. The DB-02's mid-range is slightly more prominent and forward, but less organic and slightly dry. The DB-02's low end is punchier and more textured, but it rolls off earlier and lacks sub-bass rumble. The ZSR is more detailed in the treble and mids, has a much larger sound stage and in general it feel it is easily the better sounding and more engaging product.

thinksound ts03+mic (119.99 USD): The ts03 is a single dynamic, wood bodied earphone with a warm, bassy signature. It has a very traditional barrel-shaped housing versus the ZSR's shapely, ear hugging shells which gives the ts03 a more universal fit. I also prefer it's materials which are a mix of wood and aluminum giving the ts03 a simple, but timeless look. The ZSR is not in the same ballpark in terms of visual appeal, to me at least. Neither earphone has a particularly fantastic cable, though I'd take KZ's over thinksounds. It is more flexible, thicker, more memory resistant, and it better relieved.

In terms of sound, the ZSR is notably more treble heavy, but in terms of mids and bass are quite similar. The ts03's bass is tighter, punchier, more textured, but the differences aren't as vast as the price would suggest. The ZSR's presentation is more open and spacious, slightly more visceral, and on the deepest notes gives you more physical feedback. The ts03's mid-range is similarly placed, but given it has a more balanced sound comes across more prominent. I'd say the ZSR's mids are more textured and detailed, but not quite as natural, something the ts03 excels at. In terms of treble, the ZSR is again more detailed. The ts03 is smoother though, lacking the sharpness the ZSR portrays at times.

Final Thoughts:

To my ears, the ZSR is Knowledge Zenith's more successful attempt at a hybrid yet. It's not the most technically adept of the group, a title which probably goes to the ZS6, nor will it likely have the mass appeal of the more relaxed ZST, but upon listening to all their hybrids back-to-back, the ZSR gets my vote because it sounds the most coherent and mature in it's tuning.

If you're in the market for a budget hybrid and were considering one of those from KZ, pending you've got the ears to hold them and are not absurdly sensitive to treble, the ZSR is easy to recommend.

Thanks for reading.

- B9Scrambler

***** ***** ***** ***** *****

Some Test Tunes:

Aesop Rock - Skelethon (Album)
Daft Punk - Random Access Memories (Album)
Elton John - Yellow Golden Brick Road (Album)
King Crimson - Lark's Tongues in Aspic (Album)
King Crimson - Starless and Bible Black (Track)
Supertramp - Crime of the Century (Album)
Infected Mushroom - Converting Vegetarians (Album)
Infected Mushroom - Legend of the Black Shawarma (Album)
Gorillaz - Plastic Beach (Album)
Massive Attack - Mezzanine (Album)
Fleetwood Mac - Rumors (Album)
Run the Jewels - Run the Jewels (Album)
The Prodigy - The Day is My Enemy (Album)
Tobacco - screw*d Up Friends (Album)
Felt - Felt 2 (A Tribute to Lisa Bone) (Album)