I just hooked it up, breaking it in now.... I can say....

It sounds good already, MUCH better than My BA PV600, no rumble- just deep and clean...
Needs more time though, from what I've read these drivers need a bit of time to break in, I dunno if thats true, just read it online...

Clean sound, NOT boomy- tight, and quick..... more to come as time passes, but I'm VERY happy already!!