Got the Ultra12 delivered (missing a power cord, which EMO sent to me post haste).
My room is about 2500 cu ft. So average, to larger than average HT room.
I'm running Onix Rockets all the way around in a 7.1 config. Had an Epik Phoenix in the mix, but pulled it out just to see what the Ultra 12 could do on its own.
In short, the Ultra 12 is a very nice sub. It's built well. Weight and size comparison to my Phoenix really isn't fair. The Phoenix absolutely dwarfs it. But, a nice 14" square cube with a quality driver, quality build, quality electronics? Very nice job by Emotiva. I was wondering about the weight (again, the Phoenix would squash it like a grape). My worries were unfounded. Put on the (included) feet and this sub anchors down and pumps out some prodigious LFE. LFE in the 25Hz-30Hz and up range is rendered with authority and with no "floppy" overhang. It's tight and musical, too. Played a BD that had broke my previously owned HSU VTF3, Serenity. The Ultra 12 handled it, with ease. "Brothers in Arms" DVD-A ("Money for Nothing" track, in particular) has a drum intro that will stress lesser low end speakers. Again, the Ultra 12 attacked it hard, and cleanly. Impressive.
The Ultra 12 won't reach into that sub 20 Hz range. And, if you've got a huge room, you probably want to go with duals (or quads) to get the last word in SPL and smoothness. But, for a medium sized room, or coming from an "old" sub, or a sub that may be feeling substandard in the size dept (talking those old 8", 10" and some 12" subs), the Ultra 12 seems to me to be a performance vs value leader. In short, very hard to beat for the money. I mean, $399 + free shipping? Free trial? Hard to really go wrong.
For those who are curious, adding the Epik Phoenix back into the mix with the Ultra 12 (which is the reason I bought it to begin with), well......my LFE was just bumped up to a much higher level that even I was surprised by. The Phoenix getting down real low, and putting out impressive SPL, with the Ultra 12 doing tight duty higher in the Hz range.
I'm sure I might be able to get better performance, but I don't think I'd be able to do it without adding quite a bit to my LFE investment.
I'm pleased, if you couldn't tell.