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Use of an a/d/s/ AC502 remote subwoofer level control will allow us to control the volume of our subwoofer from the front of the car. How convenient! This way, we can match the bass level to our own personal taste or to compensate for bass masked by road or wind noise. 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