THE CLK's stereo unit includes a CD player with a six-disc stacker in the boot.

An AM/FM radio and cassette player are included. Eight loudspeakers are scattered through the cabin, including two tweeters concealed behind the plastic covers of the right and left mirror triangles. Two mid-range loudspeakers are installed at the front and rear of each door panel. Two woofers are mounted in the parcel shelf. The aerial is integrated into the rear window and takes the form of two special wires: one horizontal wire is for medium and long-wave reception, while AM/FM programmes are received by one horizontal and one vertical wire.