OK, so after looking around some more, I realize I can get a 12" powered sub for under $350. I'm thinking that might be a good and cheap way to go. I could then use my amp to power my towers full-range and use the sub for my LFE channel. Looking around I found a brand called Bic America. Never heard of them, are they any good? There is one with a 12" Kevlar cone and 1000W amp for about $333. Any suggestions? Also, how much difference is there between a 12" and 15" sub? \
Thanks for all the help!
NHT speakers, Denon 4520, Panasonic 65VT50, DUAL PSA XS30SE's