I know this is going to sound really dumb, but... I've heard of some people using two subs at the same time. My question... well, I've got two of them: Firstly, for those who've done this, what benefit did it bring? Is it a noticable difference? I suppose I should also ask... WHY did you do it? Really big room, or... ? Secondly, how do you connect it? I know this has got to be obvious, and I'm feeling rather stupid to even ask, but... nearly all receivers have only one sub pre-amp output, so where does Sub #2 get it's signal from? Are there amps out there with two S/W pre-amp outputs, or is it some trick I'm missing?