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Honestly, im not sure.
I read in Crutchfield magazine to turn the amp all the way down, then set my radio to the loudest level that i will ever use, then turn the amp up three quarters power, to prevent blowing the speaker. Seems to work.
I dont even have the gains 1/2 way up on mine and the deck volume 3/4 up and I cannot see out the mirrors very well.