Knowledge Zenith KZ EDX Single-Dynamic Driver Earphone

General Information

The KZ EDX is the company's current budget offering in the $10 segment. It features a single dynamic driver.



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Caio Ricardo

New Head-Fier
Classic ultra budget KZ
Pros: -Good thumpy bass, with minimal bleed
-Warm mids, without being muffled
-Versatile V shaped IEM, across many genres (for the price)
-Airy and open sound (for the price)
Cons: -Hot upper mids (occasionally)
-Minimal accessories

Nothing much to write home about, just the IEM itself, cable and three pairs of eartips


Bass - Big midbass but well placed

Good bass impact, without being too boomy and slow. Average decay and attack with little subbass roll-off, not that much looser kind of bass thanks to the upper mids peaks, texture a bit lacking but okay for the price

Mids - Warm and open

A little harsh kind of mids, sometimes very unforgiving with old and poor mastered tracks. Besides that, very passable and okay mids performance for a 7 USD IEM

Highs - Crisp and vibrant

Good treble extension and details, sibilance can show up sometimes but not a big deal. Cymbal crashes are occasionally very harsh for my liking, but if you are a low volume listener it might not bother

Still Worth It?

If you are tight on the budget and want a brighter V shaped IEM, certainly yes. But if you are sensitive to shouty upper mids, maybe the TRN MT1 or OG QKZ VK4 are better deal for you, and if you can stretch the budget a little more you can get a lot better options (CCA CRA, 7hz Zero, Moondrop Chu, Tripowin Lea)


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Previously known as sub30
Pros: Attractive “clear/crystal” shell
Cheapest IEM with removable cable
Good quality cable
White Starline tips
"Decent" bass quality
"Decent" separation and imaging
Cons: Treble P.E.S.
Non-existent layering
Metallic timbre
Harsh midrange
Easily gets old even with the price (there are better options at the same price bracket)... don't get caught by the hype

I would like to thank CCA Earphone Store for providing a review unit of the EDX. Check out their store on Lazada (Shop at CCA earphone store | Rest assured that my impressions written in this review are my own personal thoughts and opinions and in no way influenced by outside parties.

I am not an expert in this hobby nor claim to be an audiophile. I just love listening to music and am fond of writing articles.


Knowledge Zenith – the man, the myth, the legend. Arguably the most important figure of the Chi-Fi world, at least one of the companies that brought it to its glorious state in present times. The most recent releases have all been multi-driver IEMs, most not in the “budget-range.” But, out of a sudden, they release the KZ EDX, reminiscent of their very first single-DD offerings, that one can say made them who they are today. The KZ EDX is the cheapest IEM with removable cables. At just under 6 USD, depending on your region, you can choose between five different colors – black, white, smoked grey, crystal, and jade green/blue, with the last two being quite “rare” colorways and are only available in select stores. Rated at 112 dB with an impedance of 23 ohms, these are fine to drive with a phone.

These were plugged to my iPhone 5s with the SD01 amplifier for the review.


Build and Comfort: Generic IEM shell that is used in multiple products, one in particular is the QKZ VK4. Has two vents – one at the center of the driver, and the other close to the edge of the nozzle base. Mine is in a crystal/clear finish, and it looks beautiful on hand. For those saying that the KS1 shell is the same, it’s not. The KS1 has this contour to the body that makes it more comfortable than the EDX, in my case. The cable that it comes with is a 4-core cable, in a rose gold/copper-esque finish, ending in a 0.75mm 2-pin connector. A bit tangly but definitely something that you didn’t expect from a 6 USD IEM.


Now, onto sound:

For this review, the IEM was left in stock mode, without mods/cable change and only a tip change as the white Starline didn’t work for me. It was also really harsh OOTB and was hurting my ears after a few songs, burning them in helped in my experience (~30 hours using Cascade Burn-In).


Bass –
it’s good. Not amazing, but good. Extends up to sub-bass so it does not sound lacking. Not that tight but has texture. Might be a bit boomy for some as it is quite elevated and doesn't have the best quality.

Midrange – recessed and has this metallic tint to it. Lower midrange is also lacking and thus sound particularly thin on male vocals. Female vocals are unnatural, sounding overly sharp. Coupled with the upper midrange elevation, and it’s a rough experience. If you’re a vocals lover or listen to vocal-centric tracks, I can’t recommend these. It has this harshness that I’ve never heard before, until the EDX. Annoying instances of sibilance as well.

Treble – P.E.S. - Peaky, Elevated, and Splashy. I despise every bit of this region. It’s the only gear that hurt my ears after listening to a few songs. At low volume, it’s alright. But then start increasing loudness, and in shows the pierce that it has.

Timbre –
metallic. It sounds lifeless and unnatural.

Soundstage – surprisingly wide. That’s it. No perception of depth or instrument layering at all. The presentation is very 2-D.

Imaging – decent at best. Moving sounds become quite blurry.

Separation – fine. You’ll survive.

Detail-retrieval – faked as heck using the treble peaks.



Man, I didn’t want to have this first experience with the KZ brand. I actually expected a lot based on the “hype” it has garnered, but I say the hype’s not real for me. Midrange is harsh and metallic, treble is P.E.S., non-existent soundstage depth and instrument layering, fake detail-retrieval, and blurry imaging. The only redeeming qualities of the EDX are the beautiful crystal shell, removable and good-quality stock cable, white Starline tips that you can’t buy anywhere, surprisingly wide soundstage and the decent, but not amazing bass. Oh, and for 6 USD, I still don’t recommend these. You’re better off looking at earbuds which offer much more value for way less the money.

There are others that suggest to cable-roll and tip-roll. I didn’t have the resources during this review to do so. One of the “best” combinations that I’ve read is a “pure silver” cable and either foam tips or wide-bore tips.

****If you have other questions/concerns with the IEM mentioned, feel free to message me****​
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Best iem under 10$ period
Pros: Sounds excellent for 10$ especially with pure copper cable
Cons: Stock cable no good, none for cost
Don’t use spc or stock cable or you get all the negatives of the below reviews, and don’t forget to 48hrs burn in!
Kz edx
Loud sub bass
Good dd for edm
Benefits massively from a copper cable and a short burn in period
Almost ba like treble speed and extension
Best dd under 10$ period, ever
Best iem under 10$
Great imaging separation and staging
Very similar sound to tc01 ( possible same dd ) highly likely
Comfortable fit , good tips, doesn’t need amp to shine.
Stock cable can cause treble to be slightly harsh
Near bass head levels when calls for it.
Tip to reduce bass or eq slightly will improve sq
Excellent vocals and mids
Insane value at 6$
One of my favorite kz
Everyone should buy one to try but not from the KZ store on aliexpress
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