dont' just say I have "one subwoofer", because yes I do, but I've exceded other people's systems that leave them in disbelief. The best was this weekend, I had taken my system out for a few repairs, then went to circuit city for some ipod adapter for my pioneer HU. An employee there had a 13W7 with 2 JL1000/1s hookedup to it i think with a cap, and optima yellow top in the back, I "thought" it was much louder than my system until I came back with mine installed and did a voice compare. The installers there were in so much disbelief from how much sound was coming from my 1 12" 9500 that he said "I can't believe I wasted 600 dollars on a W7". Man that made me feel good, lol. Beating his W7 by a TON, and only feeding my 1501d 2v from my HU (soon to be 9.5v after overdrive is installed). Anyways, adding more cone area is the old way to just getting your system loud. The only reason I'm changing is because I want more airflow so it's harder to breathe. I know 4 12" L7s would probably get rowdy, as I've hear 2 which was decent, but I just don't want it to sound like crap. Also, one more question referring to my last post. Could I slap 2 15's on top, and 2 in the back, and have the port on the bottom? I'll make a sketch for you to see waht i'm talkin about.