AudioChainsDB
Sennheiser

HD 650

headphones

$380

Used market: $295*

Find at ThomannManufacturer datasheet

Specifications

2 of 7 values have a recorded source
Connector
6.35 mm·
Form Factor
Over-Ear·
Is Closed Back
no·
Impedance ohms
300✓
Transducer Type
Dynamic·
Detachable Cable
yes·
Sensitivity dB V
103✓

Expert Audio Engineering Commentary

Tonal Profile

Same 300 Ω chassis as the HD 600 and the same impedance peak near 100 Hz, so the 1/8 rule applies here too: a source above roughly 40 Ω output impedance adds bass, it does not just lower the volume. 103 dB/V means about 0.7 V for loud listening — trivial for an interface, out of reach for most phone jacks.

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