When the input is activated, the display reads "cd".
There are no rca jacks in the back but there is an 8 pin DIN plug.
Connect the center rcas to the right pins on the DIN jack and send 6 volts to a "specific" pin and presto - use the amp and equalizer to drive any input. _ CD changer, mini disks, mp3 players like the ipod, lyra, etc - real cool and of course your portable CD/MP3 player.
Again, the amps in the legend are not decibel killers but they are good - flat and distortion free and you get to use the equalizer and dashboard volume control. With a decent signal - from a cd you'll be shocked how good the system sounds cause the FM is mediocre and the cassette - well it was not too bad.
If you put in a cd changer you'll need to get one with a remote control or display.