Assuming a flat EQ and loudess setting, the empeg puts out perfect sound quality at 0db.

So you should adjust your amp gains so that the empeg's 0db is the normal maximum listening volume. This sets your proper maximum signal-to-noise ratio and gives you the best dynamics out of your stereo.

This is a standard installation procedure for car stereo equipment. It is covered in the FAQ right here.
_________________________
Tony Fabris