If you want SPL/SQ give the phoenix gold Ti a try . Amazing subwoofers [ http://www.cbrstereo.com/index.asp?PageAction=VIEWPROD&ProdID=500&HS=1 ] . Sound as good if not better then the IDQ and will get very loud also for $65 they CANNOT be beat . Idq is still one of my favorite subwoofers but wont get REAL loud .