I have a sub-woofer (paradigm PS-1200), the bass seems pretty decent to me. Can someone please give me a basic rundown of why that 2nd sub makes such a big difference? It can't just be because of increased bass, can it? My sub-woofer can rattle my entire building already, and i find myself turning the bass down often. Is this more or less a preference thing, like some people just love the visceral effect of bass?