Does anyone have any opinions on these subwoofers? I am in need of a new sub, and want to do it right so I can kill my upgraditis (I'm a college student and having no job this summer really killed my savings). I am also tired of transporting and finding room for my Acoustic Research PR1212 sub, so I definitely want something smaller. My main speakers are GR-Research A/V-1s, if sub/speaker matching is really important. I guess I'd like to know if the sub will match well with these. Does the sub play cleanly? Will it have significant output at 20 Hz? How does it compare to other possibilities in the $500 range? Anyone willing to share their experiences would be greatly appreciated. Thanks!