I have a Yahama 8" 120-Watt Powered Subwoofer and I'd appreciate some modification advice in "tightening up" the sound. It's hard to describe the sound. I would go with "airy" and "hollow", meaning that it sounds like the bass is not crisp but unfocused. It does not sound "floppy". Can anyone reccommend some simple modifications (and I'd appreciate a link to any products) I can do? I think this sub could be solid if I could tighten the sound up a bit. Right now, I need to keep this sub. I have a better sub, but currently it's much too big and too loud for my current living situation. So please, only advice on how to modify this sub!