In ear headphones earphones noise cancelling headphones series sennheiser club orpheus sennheiser ie type of fitting in ear transmission mode wired features gold plated jacks manufacturer specific features extra wide band xwb d2ca sound functions bass boost active noise reduction sound mode stereo sensitivity 125 dbmw impedance 16 ohm frequency response 5 46500 hz driver 7 mm number of drivers 1 distortion factor 006 length of cable 11 m