audio-sound @ hatena

An audio review & news blog. The volume should not exceed 80 dB is recommended. I usually adhere to the safe-listening style by WHO. Please note that my aural impressions and interpretations of measurements are also made from a safe-listening style.

(Chi-fi IEM Review) KZ EDX Ultra: Midrange with excellent texture and deep lows, but highs tend to be the weakest point

KZ EDX Ultra

KZ EDX Ultra




  • This review is based on a sample provided by KZ to convey a sincere quality review to our readers.
  • No remuneration or compensation, such as a manuscript fee, has been received for publishing this, and it is an honest evaluation based on measurement data from personal testing and personal opinion.
  • Please read the privacy policy of this website.


  • People who are sensitive to mid-range textures
  • People who are not sensitive to high frequencies
  • People who value a sense of weight


Overview of KZ EDX Ultra

This review will give an overview of KZ EDX Ultra. A complete review of this product can be found here.


audio-sound Score

  • Total Score: 8.8 / 10.0
  • Package: 7.5 / 10.0
  • Build quality: 9.0 / 10.0
  • Fitment: 8.5 / 10.0
  • High range: 6.5 / 10.0
  • Mid range: 10.0 / 10.0
  • Low range: 9.5 / 10.0
  • Less distortion: 8.5 / 10.0
  • Cost performance bonus: 10.5 / 10.0


  • Want to see the score ranking? Click here!


Basic Specifications
  • Frequency response: 20Hz to 40kHz
  • Impedance: 26Ω
  • Sensitivity: 112±1dB
  • Cable connector: 0.75mm 2pin



Packaging meets price standard. The outer box is simple and made of paper, making disposal easy.


Package contents
  • KZ EDX Ultra
  • eartips
  • Manual


KZ EDX Ultra
KZ EDX Ultra

KZ EDX Ultra


Build quality

Build quality meets the price standard. In fact, it is more than the price.


KZ EDX Ultra
KZ EDX Ultra
KZ EDX Ultra
KZ EDX Ultra
KZ EDX Ultra
KZ EDX Ultra



The fit is good.


KZ EDX Ultra
KZ EDX Ultra
KZ EDX Ultra
KZ EDX Ultra


Sound quality

REW Frequency Response

The present measurements are optimized to peak at 9 kHz based on the measurements taken at HATS.


Sound quality description

In this review, I use the standard eartips size L and drive it with the FiiO M15.


The KZ EDX Ultra has a sound balance of a full midrange with a neutral sound in mind, and these IEMs carefully listen to the highly transparent midrange.


Please see here for detailed reviews on sound quality.


Sound quality general comment
  • Original Sound Fidelity: A+
  • Recommendation: B+
  • Personal preference: B


The KZ EDX Ultra is a fairly well-crafted IEMs that suggests that KZ is learning to tune better, unlike in the past. However, it is not for everyone, as there is a definite weakness in the high frequencies.


Personally, in the same price range, I would recommend the CCA CRA for highs and lows, and the Tripowin Lea for mids.


Sound quality features
  • High original sound fidelity
  • Good vocal focus
  • Excellent texture expression
  • Heavy low-frequency range
  • Forward localization
  • Delicate sounding highs
  • Rather good high-frequency extension


  • High frequencies that tend to sting and sound irritating
  • Poor localization


KZ EDX Ultra


General comment

The KZ EDX Ultra is an excellent IEMs with audio specs and build quality above its price point, but it has the disadvantage of being habitual in the high frequencies, which can easily become a weakness. It is likely not suitable for those who are sensitive to high frequencies, as they will feel the sting, and that is the only drawback, but other than that, it is a relatively easy choice to recommend.


KZ EDX Ultra

KZ EDX Ultra

KZ EDX Ultra