A4000
headphones
$160
Used market: $125*
Specifications
3 of 6 values have a recorded sourceExpert Audio Engineering Commentary
Tonal Profile
100 dB/mW at 18 Ω is about 117 dB/V — comfortably driven, but ten decibels behind the Chinese in-ears at the same money. final tunes for a distant, diffuse presentation, and the low sensitivity is part of why it survives being turned up.
What the datasheet actually says
Quoted verbatim from the manufacturer’s own page, with the date we checked it. We state what is printed, not what anyone intended by it.
«感度 100dB»
The identical 100 dB, with no unit, stands on final's A4000 page (18 Ω) and E3000 page (16 Ω) — different housings, different drivers, different loads. Neither page names milliwatts or volts, and the English version of the site reproduces the Japanese table unchanged, labels included.
checked 8/5/2026* Estimated with the depreciation fallback (~78% retained value). · checked on 8/5/2026