Headband headphones series sennheiser px line type of fitting on ear transmission mode wired features collapsible adjustable headband in line control music function volume sound function in line volume control sound mode stereo button position on cable sensitivity 115 dbmw impedance 32 ohm frequency response 10 21000 hz number of drivers 1 distortion factor 01 length of cable 12 m types of cable straight cable single sided jack 35 mm