I ran into similar setup obstacles with my bass trap in the corner that sounds best in my room for subs, my previous MX150 mk2 was about 12" from the rear wall and about 11" from the side wall and the 24x24x4 open back bass trap was 18" off the floor across the corner. This did wonders for the 50hz bump in my room! and I had no plans to change it, well the addition of the Marantz 8801 and the upgrade to the DXD12012 would soon change that. I went all in and placed the 12012 in the corner at 6" from the rear wall and 2.5" from the side wall in the right front corner of my room, now this meant the bass trap had to be placed behind the right front speaker where it continued to help for my 2/ch habit I can't let go of :dumbcrazy: So there is the first win, now after fine tuning the 12012 for music without the aid of DRC (Audyssey) I ran the calibration and viola! I have clean, visceral ,articulate and deep, deep bass that locks onto the room and delivers a tympani strike that is very realistic in tone and decay. The most amazing thing is the lower strings and blat form brass that the DXD's are capable of reproducing with the same level of reproduction of a well designed midrange driver :gulp: Yes its that accurate and quick enough that it almost boggles the mind As you can tell I'm a huge fan of multi/ch classical sacd :Tand its how and what my setup is configured to reproduce well first , this by default has always yielded fantastic movie playback as well.Hmmm...interesting suggestions! I'll be playing around with firing the 12012 into the wall, rather than aimed at the couch. Last time I attempted this, I "felt" the bass to be coupled better in my room. In that case I used several stereo recording of classical pieces to make my decision. Now, however, I have XTZ and the Audyssey Sound Equalizer to aid in finding the more appropriate location. There are many schools of thought on sub placement, but a few of them (including Ken) see corner/wall placement to have the best overall time domain response.
My only concern involves my bass traps somehow impeding the 12012s output if the sub is placed in close proximity to them. I suppose I'll have to check the overall output with XTZ of the 12012 right next to the bass trap, and further along the wall. I have precious few adequate spots to place the sub!
Another question for the fellow users here: Has anyone adjusted their variable phase knob on the DXD in conjunction with their preamp/receivers distance controls? Some phase knobs only operate at a narrow frequency, while others operate along the full response of the subs output. I'm unsure which the DXD operates at. I would assume the DXDs' entire "phase" shifts below the selected crossover frequency that the user selects on the sub itself...
Bottom line! lose the panel or move it completely away from the corner as the DXD12012 loves its space floor to ceiling. And on the phase , I'd leave it alone if using DRC.
Hope this helps!