a higher Preout voltage does a couple things--------------- has more dynamic range.-------and a higher voltage level to push through the car OVER the noise.-----so yea IT would cause you to turn DOWN the gains on the amp---A good thing---with reguard to noise. HIGHER preout voltage shows a certain quality about the preout stage design.---with reguard to noise preventionOriginally posted by ace7733 I was wondering the same question...anyone else know for sure?