Headband headphones series sony mdr z type of fitting over ear transmission mode wired features collapsible manufacturer specific features high resolution audio sound function passive noise reduction sensitivity 100 dbmw impedance 64 ohm frequency response 4 120000 hz driver 70 mm number of drivers 1 membrane aluminium membrane magnet type neodymium voice coil copper length of cable 3 m types of cable removable cable double sided straight ca