sten for distortion. If you reach a point where the volume is louder than you will listen to, before you hear distortion, then stop there. Otherwise, keep going till you hear distortion, and cut it back slightly till it disappears. Remember that volume setting. That is the maximum volume you want to play it at.Grab some good CDs and go for a ride. Listen to all types of music, and stop the car, and make adjustments as necessary. If you have multiple amps, and an equalizer, it will take much longer to get it set the way you want it. But this is the fun part!...