AudioChainsDB
Superlux

HD681 EVO

headphones

$45

Used market: $35*

Manufacturer datasheet

Specifications

3 of 7 values have a recorded source
Connector
3.5 mm, detachable·
Form Factor
Over-Ear·
Is Closed Back
no·
Impedance ohms
32✓
Transducer Type
Dynamic·
Detachable Cable
yes·
Sensitivity dB mW
98✓

Expert Audio Engineering Commentary

Tonal Profile

Same electrical passport as the plain HD681 — 32 Ohms, 98 dB/mW, 300 mW, 50 mm — with a detachable cable and different pads. From the amplifier's point of view nothing changed; what changed is what you can replace when it breaks.

* Estimated with the depreciation fallback (~78% retained value). · checked on 8/5/2026