Alright, I have a '91 Chevy Suburban 3/4 ton. I have a Rockford 501S AMP in it and a Polk Momo MM12 500WRMS 1000WPEAK and I was just driving today and I poped in my Metallica CD and I had the bass maybe 1/2 up, and that thing pounded really hard. Literally, I had to turn the thing off I couldn't breath. I was just wondering what kind of DB I would be looking at. I wasn't making my Chevy for comp, just SQ when I go driving. I just wanted to know around how much DB. I've never got it tested, but I am thinking about getting it tested.