Specifications for the Sennheiser HD 650
- Transducer principle: Dynamic, open-back
- Frequency response: 10 Hz – 41,000 Hz
- Sound pressure level (SPL): 103 dB
- Total harmonic distortion (THD): < 0.05% (1 kHz,)
- Cable length: 3 meters (detachable)
- Connector: 1/4” (6.35 mm) stereo jack plug with a 3.5 mm adapter
- Weight: 260 g (without cable)