KZ ED4 – Review



| Dynamic Driver |

? The KZ ED4 are among the classic earphones from Knowledge Zenith and we thought it was about time that we tested and reviewed them. In case you missed it, we have already reviewed the latest earphones from KZ: the KZ ZS5, KZ ZST, KZ ZST PRO, KZ ZS3 and KZ ED12 among many other KZ models that we have tested. The KZ ED4 have metal housings that look and feel premium, the back section has a metallic mesh that suggests an open-back design like we have seen on earphones like the GeekRover iEPW021 or the KZ EDR2. The overall housings are solidly built while remaining lightweight. The cables are the very classic KZ cables that can be found in iconic KZ models such as the KZ ATE and the KZ EDR2 among many others, which is a very rubberized rounded cable with a mainly copperish color that does a great job against tangling issues. The cable of the KZ ED4 has an inline microphone and 1-button control that allows to skip songs, play/pause music or answer/reject calls. You can buy the KZ ED4 either with or without the inline microphone and 1 button control.

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KZ ED4 - Review

Tests & Scores




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Accessories & Packaging

The packaging of the KZ ED4 is the classic first generation KZ’s small dark cardboard with a small bag inside that contains the extra accessories; in this case 2 eartips.



Bass & Sub Bass

The KZ ED4 have fun bass with punch and depth capable of fulfilling most genres. The energy coming from the dynamic drivers of the KZ ED4 will be enough and not too boosted. With an EQ, sub-bass gains depth and mid-bass gets out of control sounding boomy. During our extreme bass tests the KZ ED4 was able to handle 46% of the maximum power of a Fiio E12 Mont Blanc set to high gain, with it’s bass boost turned on and with a custom basshead EQ applied. The results were an exponential increase of depth and punch with a marginal impact and rumble. Despite the very empowered bass they were unable to reach a basshead level and remained below the KZ ATE‘s impact capacity.


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Mids & Vocals

Mids are warm and cozy with strong mid-bass bleed and somewhat laid back lower vocals at times, if less mid-bass centered songs are being listened their lower vocals will sound much better. Higher mids are not harsh. An EQ makes lower mids clearer with the right amount of kick as to not reach any boxy sounding vocals. Higher mids can start to show some harsh peaks at times.



Highs & Treble

Highs on the KZ ED4 exhibit a slight level of detail and are nicely bright and airy. A bit of piercing highs and some sibilance is present but not excessive, if it is within your tolerance will depend if you are too treble sensitive or not. Using an EQ, highs become noticeably brighter and a lot of detail is gained. On the negative side, more sibilant highs will arise.





Sound Leak

Their sound leaking levels are extremely subdued and under control, among one of the best performers in this aspect. You can use them even in libraries at moderate volume levels with no concern of disturbing nearby people. As what happened with the KZ EDR2, the KZ ED4 have an aesthethical look that suggests an open-back design but watching at the results of their sound leaking levels it certainly does not look like they are opened on the back.



Sound Isolation

The sound isolation performance is slightly above average, they will lower the perceived ambient noise but to get a full isolation medium and high volumes are needed.




The KZ ED4 have a classic bullet-styled design which offers ease of handling and great comfort with no protruding or hard edges that could possibly touch the ears and generate pain. They will offer hours long listening sessions without pain or fatigue.



Response to Equalization

A custom EQ can be applied to the KZ ED4 and they will show noticeable improvement in some audio frequencies. Sub-bass will get deeper but mid-bass could get out of control; vocals will sound better but higher mids could become harsh; higher frequencies will add substantial detail with the cons of more sibilance.


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Scores Scores

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Driver UnitUnknown Size
Power CapacityUnknown
Impedance16 ohms
Frequency Response4-24,000Hz
CordY-type, round cord
Cord Length1.2m
PlugL shaped stereo mini plug
WeightAprox. 14g
Supplied Accessories3x Earphone tips (silicone)

We highly discourage anyone from trying to apply our testings to your own earphones, the risk of damaging or permanently breaking your iems is absolutely probable to happen. With our standardized equalization and amplification tests we push the limits of the earphones to the extreme. If anyway you decide to do so, we cannot be held responsible of the damage done to your equipment. Do it at your own risk.






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We hope you enjoyed this article. All the earphones reviews, earbuds reviews, headsets reviews, in-ear monitors reviews (iem), in-ear headphones reviews are made as objective and thorough as possible to provide our readers a way to choose the best earphones, earbuds, iem, in-ear monitors, headsets and in-ear headphones. By providing exhaustive information we allow our readers to even fine-tune their choices to select among the best budget earphones, best earphones for sports, best basshead earphones, best fun sounding earphones, most balanced earphones, least fatiguing earphones, most comfortable earphones, best looking earphones or even for the best cheap earphones to buy.  Our resources offer: In-Depth Earphones Reviews, Earphones Scores Compared, an Earphones Size Comparison Tool, a sound frequency cheat-sheet, an Earphones Amplification Comparison Table, a brief audio glossary with the most frequent audio terms and audio definitions, and our Earphones Top Charts (covering the Top 10 Basshead Earphones, Best Bang for Buck Earphones, Top Sports Earphones, Best KZ earphones, Best bang for buck KZ earphones, Best basshead KZ earphones, Best KZ earphones for bass, Best KZ earphones for gaming, Best KZ earphones for sleeping, Best KZ earphones for working out, Best KZ earphones under $20, Best KZ earphones under $50, Best smallest KZ earphones, Top Balanced Earphones, Top Fun Sound Earphones, top smooth sounding earphones), Best Xiaomi Headphones, Best Xiaomi Earphones for Bass, Best Xiaomi Headphones under $50, Best Xiaomi Headphones under $20, The Best Xiaomi Wireless Headphones, Best Bang for Buck Xiaomi Headphones, Best 11.11 Deals and Coupons – Aliexpress – Gearbest – Banggood, Black Friday Coupons and Deals, Aliexpress Anniversary Sale Coupons and Deals, Cyber Monday Coupons and Discounts, Black Friday Coupons Aliexpress, Gearbest, Banggood, Amazon Coupons Discounts Deals Promo Codes Sales, ALIEXPRESS Coupons and Promo Codes – Exclusive Discounts