In ear headphones series sennheiser street line sennheiser cx line type of fitting in ear transmission mode wired features gold plated jacks sound function passive noise reduction sound mode stereo sensitivity 110 dbmw impedance 16 ohm frequency response 20 20000 hz number of drivers 1 distortion factor 02 length of cable 12 m types of cable straight cable symmetrical double sided jack 35 mm jack shape l shaped material plastic weigh