I have a weird thing going on with my 8801, and maybe it's something totally different. I have a Funk Audio 18.0 w/LMS 5400 driven by a behringer ep4000 and then I have another sub that was built with the exact same driver (TC Sounds LMS 5400), exact same size/shape cabinet, driven by a behringer ep 2500 (same amp for all intensive purposes). Setup across front stage is L, Sub, C, Sub, R.
When I run XT32 I level match the subs and the gain on the amps are pretty much dead on as they should be and the output on the subs show about 76db so all good there. Then XT32 runs its thing and when it's done the only thing I change is the crossover (from 40hz to 60 hz). XT32 set the left sub at -10.0 and the right sub at -10.5 which seems about right.
Here's where the tricky part comes in, there is hardly any output coming from the right sub. In fact I actually have to stand 6 inches in front of it to even make sure it is even on. The left sub is deep, huge, tight, (add just about any adj. you want here)! I even went in and changed the gain from -10.5 to -6.0 and it still is not even close to the left one. The output is louder but nowhere near as huge and deep as the left one.
So I'm thinking that there must be some canceling going on but wouldn't the left one also cancel out and be much softer as well? My room dimensions are 16x22x7.5!