Sennheiser HD 600 Headphones An open-back with a 42 mm dynamic driver An acoustically transparent open-back earcup that lets every sound wave expand freely. This Sennheiser innovation was pioneered and perfected for the
SENNHEISER AURICULAR HD650 Headphones Dynamic Open-back Impedance: 300 Ohm Sound pressure level: 103 dB Frequency range: 10 - 41,000 Hz 3 m Cable with 6.3 mm stereo jack plug In the Sennheiser HD 650, audiophiles will