I purchased this driver a few months ago and finally got around to posting about it. I'll post questions in order with numbers so as to make it easier to answer and help me out or tell me what i'm doing wrong. First of all the driver was received in perfect condition with packaging that would have made Santa proud. Thanks Dave VT. 1: The driver makes some very serious clacking noise as if bottoming out when volume gets a little high. At low to moderate levels it sounds great.When I say high I'm only using an older Pioneer 60 wpc receiver to push it and only turned up to 3/4 volume with the sub output on my receiver only 1/2 up.This is nowhere near reference level. I've thought about getting the Parts Express 250 sub amp but I'm afraid of what that would do. Any ideas on whether that would help or make things worse. 2: I have the driver mounted firing forward into the room. All the SVS drivers [I believe this one was out of a 20-39]that I have seen were bottom mounted and down firing. Is it possible that mounting it vertically could be doing damage or just not right for what this was designed for. Thanks for any help or comments.