I've been PMing a lot of folks with this question and have gotten a lot of helpful answers. However, I'm still on the fence. My current situation is I have a HSU ULS-15 + MBM-12 and while I'm not UNhappy, I got the upgrade bug and want a little more IMPACT than the ULS can give me while keeping the SQ I already have. I've tried a PSA XS30 and SVS PB12-NSD and while both are great, they're just not giving me what I'm looking for - more output with great SQ. I've looked at the Rythmik FV15HP but it's just WAY TOO BIG given the way it must be oriented in the room, so no recommendations as I'm sure that would be the go-to response. Moving on, I've been considering the following options...
1. Add a second ULS-15
(Off the list)
My current ULS-15 bottoms out with ULFs at moderate volumes, even with the ULF trim set close to 50hz. My concern is even if I add a second I'll still have the same problem. I would not co-locate, the second ULS would go on the right side of the room. My problem may be related to Audyssey blowing out the ULFs...I may have to rerun to see if it helps at all.
2. Seaton SubM HP
When I placed the XS30 where the ULS was I got a relatively flat response, but just not the overall sound I was looking for, especially at higher volumes. I believe the sound quality and performance of the SubM would give me this.
3. JTR Cap S1
It fits my size requirement and gives me the output. However, I'm not sure how it compares to the SubM in SQ. I believe I read that it's close but I can't find the post.
4. DIY Two 3 cu ft cabinets, each with 15" drivers
Considering the Dayton 15HO or SI HT 15D4. Would need to find an amp, perhaps an EP2500 or SA1000. Cheapest option (if I sell my current equipment) and probably the most fun.
Below is a diagram of the room. HELP!