The KZ ESX ranks #547 out of 668 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: KZ
Prices on this page were last checked October 12, 2026 at 4:13 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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#547 KZ ESX Discontinued eBay
Pros: Bass is lifted about 3.9 dB with extension to 20 Hz, giving kick drums and bass lines extra weight. Lower mids sit within about 0.8 dB of target, keeping voices and guitars natural. It uses 1 x 12mm dynamic with an easy 22 ohm load.
Cons: Discontinued, so it is mainly found used. Presence sits about 3.3 dB low with a 5.6 dB dip near 6.3 kHz, so vocals and instruments lose some bite. A 4.9 dB peak near 8.2 kHz can make cymbals and sibilance sound sharp. A Harman score of 62 places it in the lower part of the in-ear rankings.
| Released | 2022 (4 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.58 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 12mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz |
| Harman Preference Score | 62 (median of 10 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 22 ohms |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.5 dB at 30 Hz) |
| Tonal Tilt | -1.01 (negative is warmer, positive brighter) |
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