32 kbit/s – MW (AM) quality
96 kbit/s – FM quality
128–160 kbit/s – Standard Bitrate quality - probaby stock 370Z system
192 kbit/s – DAB (Digital Audio Broadcasting) XM (but not quite. depends on channel and reception)
224–320 kbit/s – Near CD quality
For me CDs do not play anywhere near 300 kbps or CF Card quality for some reason. This is the CF card I bought:
Newegg.com - Kingston 4GB Compact Flash (CF) Flash Card Model CF/4GB - Flash Memory
You will also need a card reader and save high quality MP3s to it. Do a lossless rip as theDreamer said from a CD or download on internet. Plug it in and the Bose system becomes alive. The switching between songs is instant, not like with Musicbox or CD or XM where there is a little lag. Full text is available including file name on the screen if you have navigation.