Complete Guide Audio System Upgrades for BMW 5 Series (E39)
Part of content: Our subwoofer could be the same one we chose for Upgrade I or something more. The entire system will be powered by an a/d/s/ amp, and will use an AC502 for remote subwoofer level control. This BMW system is going to sound dynamic, smooth, and musical, yet still maintain totally stock cosmetics inside the car.
You will need part # 65-12-8-364-756 from BMW to send the audio signal from the changer to the factory tuner pack. You will also need to add the rear output leads on the factory tuner.
