I just recently got an SVS 20-39pci. I calibrated using the Avia disc and I must say that it has added some serious "oomph" to my video games and movies. But I'm just curious as to how far I can push the sub. So my question is, when a sub bottoms out, is it really noticeable? And in another thread I heard about subwoofer "fluttering". Is that the same things as bottoming a sub out?