To use the KN7000 alone, you will need a PC and the Panasonic Card reader/writer and Jukebox software kit. This enables you to save compressed CD audio files to an SD card in a format that can be played on your KN7000. Another alternative is to connect the output from a CD player to the Line inputs on your KN7000 and use the CD's directly. Alternatively you can connect the output from any MP3 player, Ipod etc to the Line inputs on your KN7000 to use other compressed file formats.
Cheers
Len