I did not walk around the room with my SPL meter, no. I had to do all this the manual method with a tripod, so I wasn't going to do any more work.Nuance, this is the first I have heard about such a huge dip in TC driver. What could account for it? Also you applied 15db of boost?! so 10w @30hz == 320w @60hz? Did you try walking around the room with an SPL meeter? I had a similar huge dip in F/R and found that the power was just elsewhere in the room (not at the listening position). Mine of course was a room interaction. I also didn't see info on the design of your box that the TC is struggling with.
You're probably right, though, as it was probably a combination of room and driver. I thought you were saying it was only the room node, in which case boosting at 63Hz wouldn't have raised it one bit.
My enclosure is 20" ^3 with solid bracing. It's internal volume is about 3.3 cu ft. My buddy's TC2000 sub (same enclosure and bracing) rolls off pretty steep at the same frequency. The TC 2000 and 3000 drivers are known to roll off pretty quickly after 60Hz, but I never thought it would interact in such a way that it would be a 15dB drop. :scratch: Anyway, I've got an M-Audio MobilePre USB set to arrive on Tuesday, so I'll use REW then and nip this in the bud.