Headphones — Sennheiser HD 650

The HD 650 is a legendary open-back over-ear headphone from Sennheiser, built with a demanding impedance and a fixed 6.35mm connector. The HD 650 brings Sennheiser's most storied engineering heritage to an open-back, over-ear format.

Key specs that matter

The transducer uses dynamic or isodynamic driver technology in an open-back, over-ear, wired configuration. Frequency response spans an exceptionally wide 10Hz to 41,000Hz within plus-or-minus 10dB. Connection uses a 6.35mm jack. Sensitivity is 103dB SPL at 1kHz/1mW, with impedance at a demanding 300 ohms at 1kHz - a figure requiring a capable headphone amplifier for full dynamic performance.

Sound and use context

Expect the refined, musically engaging character Sennheiser's legendary HD 650 is broadly celebrated for among audiophile enthusiasts, with the demanding 300-ohm impedance requiring a capable headphone amplifier to reach its full potential.

Pairing

The demanding 300-ohm impedance requires a capable headphone amplifier rather than a modest portable source for full dynamic performance.

Alternatives

Sennheiser's own HD 660 S2 offers an updated version within the same broader legendary open-back catalogue.