The optional (standard on CL 600 and CL 65 AMG) Harman/Kardon® LOGIC 7® 440 watt sound system offers digital surround-sound through fourteen speakers. Enjoy your favourite tunes transmitted through seven output channels and one sub-woofer channel, all especially developed and adapted for the interior. The bass, treble, volume, balance and fader can all be individually adjusted for finely calibrated listening pleasure.