The KZ ZST Colorful is the IEM that helped put budget Chi-Fi hybrids on the audiophile map — a sub-$25 in-ear monitor with one balanced armature plus one dynamic driver per side, a detachable 2-pin cable and a transparent colourful shell that became an early KZ visual signature. At its price it is one of the cheapest genuine hybrid IEMs on the market. This KZ ZST Colorful Hybrid review covers the driver topology, sound signature, build quality and the gaming and music use cases.
Prime YINYOO KZ-ZST Colorful Hybrid Banlance Armature with Dynamic Ear Earphone 1BA+1DD HiFi Headset KZ in Ear Monitor Headphone Wired Earbuds IEM Earphone Gaming Ear Buds (Colorful/zst Without Microphone)
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KZ ZST Colorful Hybrid at a Glance
| Feature | Specification |
|---|---|
| Driver configuration | 1 balanced armature + 1 dynamic driver (1BA + 1DD hybrid) |
| Impedance | 18 ohm |
| Sensitivity | approx 106 dB/mW |
| Frequency response | 20 Hz to 40,000 Hz |
| Cable type | Detachable 2-pin (0.75mm Type-A) |
| Microphone | Optional (mic cable variant available) |
| Connector | 3.5mm TRS |
| Sound signature | V-shaped, bright KZ house tuning |
| Approx price | around $20 |
Sound Quality & Driver Configuration
Before getting into the specifics of this set it is worth a short refresher on the technical realities that shape every wired in-ear monitor. The most important is driver topology. An IEM with a single dynamic driver (DD) moves air with a small cone-and-magnet motor, much like a miniature loudspeaker, and tends to produce a warmer, fuller and more physical bass response with smooth midrange. An IEM with one or more balanced armature (BA) drivers uses a tiny electromagnetic reed inside a sealed enclosure that vibrates with very low mass — this gives BA drivers their characteristic strengths of fine treble detail, fast transient response and excellent separation of instruments, at the cost of slightly thinner low-end weight on bass-only BA designs. A hybrid configuration combines both: a DD handles the bass for warmth and impact, and one or more BAs handle the mids and treble for detail and clarity, which is why hybrids dominate the budget Chi-Fi market.
Impedance and sensitivity govern how easy an IEM is to drive. Most modern IEMs sit in the 16 to 32 ohm range with sensitivity ratings of 100 to 110 dB/mW, which means a phone, a laptop headphone jack or a Nintendo Switch can drive them to comfortable listening volumes without a separate amplifier. Higher impedance (50 ohm and above) or low sensitivity may benefit from a portable DAC/amp, but the IEMs in this guide are all designed to be plug-and-play from a 3.5mm jack. The frequency response figure quoted on the spec sheet is usually 20 Hz to 20 kHz or wider, but it is a marketing number — the actual tuning is what matters, and is described in plain language in each review.
Finally, cables, connectors and the wired-audio advantage. The two universal detachable connectors on modern IEMs are the 2-pin (0.78mm) standard, used across virtually every KZ, CCA, Moondrop and 7Hz model, and the MMCX coaxial connector, used by Shure, MEE Audio’s PRO series and a number of premium models. Both let you swap a stock cable for a better one, an upgrade with a microphone, or a balanced 4.4mm cable for a portable DAC/amp. Cheaper IEMs ship with fixed, non-detachable cables — usually fine, but a failure point if the cable develops a crackle. The headline advantage of every IEM in this guide over a wireless equivalent is zero added latency and no codec compression: a 3.5mm cable carries the analog signal directly to the driver, which is exactly why competitive musicians, sound engineers and serious gamers still choose wired IEMs over Bluetooth earbuds.
The ZST Colorful is a genuine two-way hybrid: a single dynamic driver handles the bass and lower midrange and a single balanced armature handles the upper mids and treble, with a basic internal crossover routing the signal. The DD-plus-BA topology is the same fundamental design behind the KZ ZS10 Pro and almost every other budget hybrid — it lets a sub-$25 IEM deliver bass that single-BA designs cannot manage alongside treble detail that single-DD designs cannot quite match. The ZST is a simpler, lower-driver-count expression of the hybrid idea, but the underlying advantage is the same.
KZ tunes the ZST with the company’s house V-shape: lifted bass, recessed mids and a bright forward upper treble. Detail retrieval is a clear step up from any single-DD IEM at the same price (Panasonic ErgoFit, LUDOS Clamor) thanks to the BA driver, and the dynamic driver gives the bass meaningful weight and impact. As an introduction to what a hybrid topology buys at the budget price point, the ZST is the canonical pick.
Build Quality & Cables
KZ originally launched the ZST with a transparent colourful shell that became an iconic visual signature in the budget Chi-Fi community — translucent acrylic shells in red, blue, green or clear that show the dual drivers inside. The cable is detachable on the 2-pin connector standard, which is the same connector used across virtually every KZ, CCA, Moondrop and 7Hz IEM, meaning the vast 2-pin aftermarket of upgrade cables, microphone cables and balanced 4.4mm cables is fully compatible. Note that some early ZST variants use the slightly different 0.75mm Type-A 2-pin variant — most aftermarket cables fit, but verify before buying premium upgrade cables.
Comfort & Fit — Tips Included
The ZST shells are larger than a basic single-DD earbud because they have to house two drivers and a crossover, but they sit comfortably in most ears for long sessions thanks to the over-ear cable routing. The over-ear loop pulls the earpiece into the concha and removes cable microphonics — a standard configuration on every modern multi-driver IEM. KZ ships a basic set of silicone tips; aftermarket foam tips remain a standard $5 upgrade and meaningfully improve seal, isolation and perceived bass on any KZ IEM.
Sound Signature — Neutral / V-Shape / Bass
The ZST sits in the V-shape camp with KZ’s characteristic bright treble. The dynamic driver gives bass real weight without being bass-cannon; the BA delivers the perceived clarity and air in the treble that distinguishes a hybrid from a single-DD IEM at the price. The mids are recessed in classic V style, which is the standard mainstream consumer tuning. The KZ bright treble is the most polarising element — sensitive listeners may find the upper register sharp at higher volumes. Buyers who want a more neutral, Harman-target tuning at a similar price should consider the 7Hz Zero:2.
Use Cases — Gaming / Music / Stage
For budget hybrid music the ZST is the easiest sub-$25 hybrid recommendation — the BA detail is a clear upgrade over any single-DD IEM at the same price. For gaming the bright treble helps with positional cues (footsteps, gunfire direction) and the 3.5mm jack delivers zero-latency audio. For casual everyday music the V-shape is broadly inoffensive on mainstream genres. For stage monitoring the V-shape is the wrong tuning — the Shure SE215 covered in this guide is the canonical pick. For audiophile reference the Moondrop CHU II or 7Hz Zero:2 are better choices. See our best hybrid IEMs guide for more multi-driver options.
Pros and Cons
Pros: Genuine hybrid topology with real BA-plus-DD drivers at sub-$25; clear detail step up over single-DD IEMs at the same price; detachable 2-pin cable opens the vast aftermarket; iconic transparent colourful shell; KZ house bright tuning is good for gaming positional cues.
Cons: KZ house bright treble is not for sensitive listeners; basic stock tips benefit from inexpensive aftermarket foam tip upgrade; larger shells than single-DD designs; some early variants use the 0.75mm Type-A 2-pin variant.
Verdict
At around $20 the KZ ZST Colorful is the lowest-cost genuine BA-plus-DD hybrid in this guide and a deserved budget classic. As an introduction to what hybrid topology buys at the budget price point — BA detail in the treble plus DD weight in the bass — the ZST is the textbook pick. The bright KZ house tuning is the main caveat for sensitive listeners; the 7Hz Zero:2 or Moondrop CHU II are better picks for a smoother, more neutral sound. For the buyer who wants a step up from the Panasonic ErgoFit or LUDOS Clamor without crossing the $30 line, the ZST is the easiest recommendation in this guide. See our best budget IEMs roundup for more options.
Frequently Asked Questions
How many drivers does the KZ ZST Colorful have?
Two per side — one balanced armature plus one dynamic driver — for a total of four drivers across the pair, in a genuine hybrid configuration.
Is the KZ ZST cable detachable?
Yes. It uses the 2-pin connector standard. Note that some early variants use the 0.75mm Type-A 2-pin variant; most aftermarket cables fit, but verify before buying premium upgrades.
Is the KZ ZST good for gaming?
Yes. The 3.5mm wired connection delivers zero-latency audio, the bright treble helps with positional cues like footsteps and the BA driver gives instrument separation.
How does the KZ ZST compare to the KZ ZS10 Pro?
The ZS10 Pro is a five-driver (4BA + 1DD) hybrid at around $50 with more detail, more drivers and a more substantial zinc-alloy shell. The ZST is the entry-level hybrid at around $20.
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- MEE Audio M6 PRO 2nd Gen Review: Detachable Cable Stage IEM
- Moondrop CHU II Review: Budget Audiophile Pivot Point IEM
- KZ ZST PRO X Review: Budget 1BA+1DD Hybrid Gaming IEM
- 7Hz x Crinacle Zero:2 Review: Harman-Tuned 10mm Dynamic IEM
- Panasonic ErgoFit Wired Earbuds Review: Best Budget 3.5mm IEM
- LUDOS Clamor Wired Earbuds Review: Budget IEM With Mic
- JBL Endurance Run 2 Wired Review: Sports In-Ear With Mic
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