AudioChainsDB
Superlux

HD671

headphones

$35

Used market: $25*

Manufacturer datasheet

Specifications

3 of 7 values have a recorded source
Connector
Gold plated 3.5 mm stereo mini plug, 2.5 m·
Form Factor
Over-Ear·
Is Closed Back
yes·
Impedance ohms
32✓
Transducer Type
Dynamic·
Detachable Cable
no·
Sensitivity dB mW
95✓

Expert Audio Engineering Commentary

Tonal Profile

A closed 50 mm design sold explicitly for phones — Superlux's own page says the low impedance is the point. Narrower band than the HD66x sheets claim (20 Hz to 20 kHz rather than 10 Hz to 30 kHz), and 3 dB less sensitive than the HD669 at half the impedance.

* Estimated with the depreciation fallback (~71% retained value). · checked on 8/5/2026