Who cares how loud it is? It needs to sound good. With BA it should be alright as long as the install isn't effed up
My system is JL 12w3 subs, alpine amps, and MB quart mids and highs. It's not the loudest thing in the world (or even installed at the moment LOL) but it does sound very very good. I used to do the SPL deal, but I got out of it. I did alright for what I had. My best was 143db in a cargo van with minimal sound deadening lol. (W0s none the less hahaha)