schematic wiring diagram the 2001 Volkswagen Passat Radio. The radio system consists of: antenna amplifier, right rear woofer and rear tweeter, right front woofer and tweeter, left front woofer and tweeter, left rear tweeter and woofer, CD changer unit, and lines. The woofers low audio frequencies the tweeters high audio frequencies (typically from around ,000 Hz ,000 Hz)