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KZ ZST In-ear Earphone Latest HiFi Sports Hi-Fi Headphones with Noise Cancelling and Mic Replacement Cable with Mic

100% Positive Reviews
Rated #779 in In-Ear


Pros: Nice color palette, cool cable, solid construction, decent

Cons: Large housings, lacking in resolution in the midrange


KZ ZST Review: A Victory For Audiophiles On a Budget

KZ is a Chinese IEM company that specializes in making budget grade earphones, and is well known for their high-value offerings. While they have made pretty big waves in the Chi-Fi crowd, they remain relatively unknown to the broader Hi-Fi community. That’s a real shame considering they have some very compelling products, including the ZST Colorful that I am reviewing today.

You can find the KZ ZST on at Penon Audio, here, for $20.

Disclaimer: This review is based upon a sample unit provided to me by a manufacturer or distributor in exchange for my honest opinion and un-edited words. I do not profit in any way from the writing of the review. I would like to thank Penon Audio and KZ for sending me this review unit.

Preference and Bias: Before reading a review, it is worth mentioning that there is no way for a reviewer to objectively pass judgment on the enjoy-ability of a product: such a thing is inherently subjective. Therefore, I find it necessary for you to read and understand what I take a natural liking to and how that might affect my rating of a product.

My ideal sound signature would be an extended sub-bass with a leveled, but textured, mid-bass. The mids should be slightly less pronounced than the treble, but still ahead of the bass. I prefer a more bright upper range.

Source: The ZST was powered like so:

Nexus 6P -> earphones


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


HiFiMAN MegaMini -> earphones


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

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

The ZST scales decently well with higher-end sources. It didn’t take too much amping to achieve high volumes.

Sound Signature

Initial Impressions:

The ZST has a warm-leaning sound signature, but doesn’t swing too far away from a balanced presentation. Bass presence is slightly boosted, as are vocals. Treble is present, but well balanced with the mids.

Treble: Songs used: In One EarMidnight CityOutlands

The high-hats of In One Ear were quite clear, and presented well. I expect nothing less from a hybrid IEM from KZ. Upper-treble decay is fast and precise, with no noticeable truncation.

The electronic synths in Midnight City were placed in the middle-back of the song, but never became inaudible. I’m impressed given how well the tonality of the synth was preserved despite its background positioning.

Outlands sounded reasonably open, with decent spacing and air. However, I found that violins were only of average clarity, something I still find to be quite a feat to my spoiled ears for a paltry $20. While I could certainly hear the foreground violins quite well, the background ones did not fair as well. They tended to fade in and out of audibility.

Mids: Songs used: Flagpole SittaJacked UpI Am The HighwayDreams

The mids of Flagpole Sitta were well defined and separated, but lacked some of the finer details present in some (much more expensive) IEMs. Guitar tonality was decent. Electric guitars lacked their usual intense power, but were still clear in the mix.

Jacked Up’s pianos had a softer edge to them, indicating a slower attack and decay in the mids. The guitar feedback sounded decently lifelike, but I found that separation was a little worse in this song. The ZST does tend to show its limits when presented with lots of mid-bound instruments, and more so when some of them live in the background.

Male and female vocals are presented equally well and naturally weighted. I really enjoy how they interact with my music, and really enjoy their presence overall.

Bass: Songs used: MothGold DustIn For The Kill (Skream Remix)Leave Me

Bass is present, with a slight boost. This really helps it express itself in rock and acoustic songs, such as Moth. The bass guitar, while more subtle in presentation, was still audible and dynamic.

The bass in Gold Dust had good impact and tonality to it. While it should certainly satisfy the average listener, I found my inner-basshead looking for more rumble. However, a quick boost to the 30Hz-100Hz range sorted that problem out quite nicely.

Sub-bass expression and dynamacism was quite good, with the ZST pushing pretty far down into lower frequencies. This made In For The Kill quite enjoyable, despite the ZST not being tuned for bassheads like myself.

Packaging / Unboxing

The ZST is packaged sparsely, but that’s not really a problem given the very low price these things sell for.



Construction Quality

The ZST’s driver housings are made from two pieces of hard plastic. Its name is certainly not an overstatement, as the IEM oozes colors. The housings are quite large, similar in size to some of my 2x dynamic driver 2x balanced armature driver IEMs (despite having half the number of drivers). The housings are light, and feature a 2-pin detachable cable system. “ZST” is emblazoned on the back panel of the IEM tastefully, and looks like it won’t rub off any time soon. On the side of the IEM you can see “ZST HIFI-Armature” written.

The cable has a short 45-degree angle 2-pin connector on it which fits well into the housings of the ZST. The cable itself looks to be covered in a smoke-colored transparent plastic, underneath which are several colorful twisted wires (four to be precise).

The cable terminates in a rubber-coated 3.5mm jack and sports rubberized Y-splitters as well. While there is a version of the ZST that has a universal inline remote, I have the version that does not have it.


As I mentioned earlier, the housings of the ZST are large. So despite their ergonomic shape, they do pose a challenge to people like me who have smaller ears. I could wear them for about two hours without any issues, any longer and I could start to feel them pushing against my ears.


The ZST is complimented by a rather sparse offering of accessories. However, for $20, I feel that it does suffice. Inside the box you will find:

  • 1x 2-pin cable
  • 2x extra sets of silicone eartips

While a carrying pouch of some sort would certainly be appreciated, I can understand why it was omitted.


The ZST, while not a perfect IEM, is very, very good for the price. I could find no glaring flaws for it overall, and would wholeheartedly recommend it to someone looking for a cheap, slightly bass-boosted IEM on the cheap.


This review was originally featured on Resonance Reviews. Find us here.


Pros: Fairly balanced, natural sound, decent bass, looks awesome

Cons: Horrible Fit, Poor Treble detail and extension, stupid cable with weights instead of wire

If you are looking for iems you can do much better in this price range however these aren't bad and you could definitely do alot worse. These are much better than the ZSE by KZ and are probably the best KZ pair of buds but they are not really much better than the Special Editions which are half the price.

KZ ZST In-ear Earphone Latest HiFi Sports Hi-Fi Headphones with Noise Cancelling and Mic Replacement Cable with Mic

SELLER GUARANTEE: If there is any question about the item, feel free to tell us please. We will solve it for you within 24 hrs on weekday, and provide best customer experience. Functions: Remote Control Functions: play/pause, previous/next song, answer/reject call, voice commands. Voice Command: press and hold the center button until the voice activation starting. Vary from different device. Double click the center button changing to next song; 3 times for previous song. Note: put it away from magnetic field, moisture or cold condition. Specification: Brand: KZ-ZST Cable Length:1.2m Resistance:18 Plug Type:L Bending Sensitivity:120dB Frequency Response: 20Hz-20kHz Vocalism Principle:Dynamic Earphones Type:Sports earphones Use:Portable Media Player Connectors:3.5mm Wire Material:TPE fireproof material Package Includes: 1* ZST earphone with mic 3 Pairs Earbuds in total(Small, Medium & Large)

ColorZST with mic
FeatureSuper Armature and Dynamic Unit- Combine these two advantages to bring more details of the music show and experience the real HIFI. Powerful Bass- Stronger driving force, better performance, caused by the organization of the voice coil. Advanced Technology- Professional delicate design of internal acoustic structure, optimized circuit, physical division of frequency. Unique Structure- Freely detachable and replaceable cable, patented design of silicone earbuds, ergonomic structure. MIC Design- The mic is designed by double capacitors, supporting HD mobile phone calls with US standard interface.
TitleKZ ZST In-ear Earphone Latest HiFi Sports Hi-Fi Headphones with Noise Cancelling and Mic Replacement Cable with Mic
Package Height1.18 inches
Package Length3.94 inches
Package Width2.76 inches
UPCList - UPCListElement744309487482
Model Name/TypeMPNEAN/UPC
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