Sennheiser Bionetic
Aug 23, 2002 at 11:47 PM Post #2 of 2
The three bionetic Sennheiser HD5## series headphones all use different drivers, with different impedance ratings.

HD500: 32 ohms, 105 dB @ 1 Vrms
HD570: 64 ohms, 102 dB @ 1 Vrms
HD 590: 120 ohms, 102 dB @ 1 Vrms
 

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