Summary: pre-outs, you can connect up to 3 additional amplifiers, add speakers or subwoofers. The audio can be tuned to your tastes through the 5-band graphic equaliser. It allows you to adjust the equalisation to match the distinct interior acoustic characteristics of your car. And of course, you can enjoy your entire music collection on the road. Play audio from your CD collection, iPod, iPhone, USB device or SD card. Or plug in your MP3 player via the front auxiliary input.