KZ S2 Review: Ranked #631 of 865

Last updated: October 13, 2026

The KZ S2 ranks #631 out of 865 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.

Brand: KZ

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KZ S2 - ranked #631 of 865 In-Ear Headphones · Editor's rating 3/5

#631 KZ S2 TWS Discontinued eBay

Pros: Its tonal tilt of +0.38 sits close to the target, so the overall balance is neither dark nor bright. It uses 1 x dynamic + 1 x balanced armature. It is truly wireless, so there is no cable to manage.

Cons: Discontinued, so it is mainly found used. A Harman score of 62 places it in the lower part of the in-ear rankings.

Released2020 (6 years ago)
ConnectionTrue wireless
Deviation From Target3.24 dB standard deviation
Driver TypeHybrid
Drivers1 x dynamic + 1 x balanced armature
Form FactorIn-ear
Harman Preference Score62 (measured by crinacle, via AutoEQ)
Tonal Tilt+0.38 (negative is warmer, positive brighter)
EQ preset to match the Harman target

Set a preamp of -5.9 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.

FilterFrequencyGainQ
Low shelf105 Hz+8.8 dB0.70
Peak1,030 Hz+4.7 dB0.50
Peak83 Hz-6.7 dB0.30
Peak5,547 Hz-7.1 dB4.96
Peak3,451 Hz-2.7 dB4.06
High shelf10,000 Hz+2.1 dB0.70
Peak61 Hz-0.4 dB1.31
Peak1,356 Hz-0.9 dB2.50
Peak935 Hz+0.7 dB2.45
Peak122 Hz+1.4 dB5.28

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