I never really turn up my BA PV600 sub that much(usually a lil over 3, no more than 4), I live in an End Unit Townhouse, so I have 1 adjoining neighbor.....
That is a serious PITA.......
BUT....
I listened a bit loud tonight, and I REALLY started to pay attention to the sub, I cranked it up, and went through alot of trials..........
I don't even like that sub at high output, it usually rests at low output, and it sounds decent there, but crank it up ( even to 5 or so) it sounds like dogshit..... rumbling.... ewwwwwwwwwwwwww
I will be looking into a new sub soon, HSU/SVS who knows..........
I'm looking HSU because of this forum....AVS folks seem to like them as well, although SVS is highly thought of there as well... this will take awhile I think....