First off, the issue of folded horn vs. front facing subs. I understand that the main advantage of folded horn subs is the massive amount of bass output. But they are also wayyy bigger and heavier, so is the difference really worth it? Also powered vs. unpowered. What are the advantages of each? I really don't have much experience in the area of subwoofers, but I'm in the market for one, maybe two. I just picked up a pair of JBL JRX115's, powered by a yamaha EMX 660, and I'm looking for more bass output. I'm considering one or two JRX 118 SP's. I really don't know what I'm talkin about, so I'll take any advice anyone has.