I'd like to bring up that there are alot of not so well know names of subwoofers on the market that put the big names to shame. I'm a big fan of Treo Engineering. I'd never heard of them till a friend had a set. Treo Engineering subs are amazing !!! I'd alway had Orion, Cerwin Vega, Rockford Fosgate, MTX, JL Audio ... the well known names. I'm telling you, Treo Engineering are well worth checking out !!! DD Audio are pretty awsum too. Don't let it fool you becouse you never heard of the name befor.