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Yes, write in and we can advise to your specific situation for sure.In general, if the rear wall is close to your head, the best thing you can do is thick absorption, such as the GIK Monster Bass Trap. Absorption is generally better than Diffusion in close proximities, and the thickness means the absorption extends to a lower frequency which will really help even out the low end.
Ironically, you've got an almost perfect room and layout for the Audio Physic method: http://www.stereophile.com/finetunes/179/#9mfZbvxo2MDJ0dpw.97. It is recommended that speakers be placed along the long wall and the listener be positioned in the center against the back wall. This listener position maximizes bass perception and minimizes the delay from reflected sound, maximizing the Haas effect. In the ideal speaker position, they are placed midway along short wall and 1/4 of the way into the room along the front wall axis. What we end up with are two speakers are close the middle of the room as possible with as much space behind them as in front of them.I would agree that in this scenario absorptive material behind your head would be ideal, with diffusion being a very bad idea. I do not agree that the listener will lose all depth in this scenario provided he is listening in the near field as illustrated above. I am in the camp that it is the air around the speakers that contributes to depth rather than air around the listener.
Do anything possible to avoid that situation, even with absorption it's not going to work out well. You'll be limited to a flat, dull 2-D soundstage.
I dunno, I've played with this enough in my own and others' spaces that IMO, you can't get good results if the LP is near a room boundary. Although, maybe a couple inches of fiberglass isn't enough, and if you went to extraordinary lengths (thicknesses rather ) maybe it'll work out. In all cases I found it easier simply to move the LP forward. In one case the room was small enough the chair was moved forward for listening then placed back against the wall otherwise, this could be a nice solution. One of my main goals is a 3-D, immersive soundstage and there's no way I'm going to let setup take that away.
I hope this is not out of line in the GIK forum, but the best results I've had sitting near the rear wall was with 4" thick RPG BAD panels on the rear wall. (I happily use GIK products elsewhere in the listening room, but I don't think GIK has a close equivalent to this.)
I have to agree with Roscoe65 on this one. I recently heard the most spacious 3D 2 channel system to date and it was set-up as he describes. On the wall right behind the listener was hundreds of small random pieces of wood for defraction. Not a single absorber in the room. Quite fascinating.
That's great, but doesn't mean it couldn't have been better with the LP moved forward...
I'd love to see some test data on a room set up & treated that way. We've all had our singular listening experiences, and they are important. But testing gives us a way to compare more meaningfully.
I hope this is not out of line in the GIK forum, but the best result I've had sitting near the rear wall was with 4" thick RPG BAD panels on the rear wall. (I happily use GIK products elsewhere in the listening room, but I don't think GIK has a close equivalent to this.)
Check out our panels with the ScatterPlate, and our Alpha Panels. I don't want to say they are equivalences, but they are in the same product category (ie, absorption and some binary amplitude diffusion together in one unit).
