I own a P11 with two 12' Polk Momo/ 1000w each max, 1200w jbl amp mono to the subs, 2 rear 63.1 Infiniti kappa speakers/ 150w max output, 2 front kappa perfect speakers with tweeters (component)/ 400w max outuput, and I dunno why my system sounds like SHIT. I run 8 guage wire all around. Could it be that my wire are too small for the subs? Especially my aftermarket speaker sounds worse than the stock bose speakers. The bass on my speakers sound so shitty (BTW im powering the speakers with only my head unit...no amp..could that be one of the reason?). Any advice for me is appreciated. I want to make my system bumb krazy....It sounds O.k but compared with others, it sounds like a lil mouse. I want it so it makes my body vibrate and my ears bleed! Peace.