I've personally heard the Treo's and can say that there definitly one of the best subs out there, I've also heard good things about RE and Eclipse, I was wondering if their's anything else up there with the big boys. Not alpine, you can buy that anywhere, although the type R is a good sub, can't hold treo, and from what I've heard RE or eclipse. Let me know some other top sub brands. So far I've got 1. Treo (#1 b/c i've heard it) 2. RE ( seen it, lol on a clip) 3. Eclipse ( heard good things) let me know what else to add and how you would order them... thanks spencer