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Okay, so I've done some listening in my new room, and I have determined that there is a bit of an unnatural sound in the 120-200 Hz region. I figure bass traps are always a good idea, so I have some material on the way to make some corner traps.My room is 11' wide, 17' long, and 7.5' tall. Speakers are about 3' off the short wall at one end of the room, and I sit right at the other short wall. I know the listener position is a bit odd, but I listen to large planars (Acoustat Model 3s), and I prefer their sound when I get back from them a ways. This is the third listening room I've set up where I prefer to be right against the back wall.
Anyway, I'm building corner traps out of 4" 705-FRK. Actually I am gluing some 2" plain panels to the back of some 2" frk panels to make the 4" panel... it's all I could find locally. Anyway, the corners behind the speakers are fine, I plan on bridging the corners at 45 degrees from the floor to the ceiling.
Question 1: The back wall of the room (where I am sitting) has only one unobstructed corner in which I can build a trap. The other corner has an inward opening door that is hinged right at the back wall. The door itself is on the side wall. Obviously a corner trap would not allow the door to open! So... should I put a third bass trap in the back of the room, which is directly to my right as I sit in the listening chair, and leave the door alone? This would be putting bass trap quantity over listening room symmetry.
Question 2: Should I do some alternate treatment of those corners? I could hang a 2" rigid fiberglass panel on the door, spaced out maybe 1-2". This would still allow the door to open 90 degrees. For symmetry sake, I could install a panel on the side wall opposite the door. Or, I could hang the panels on the back wall, spaced out the same 1-2". Would it make any difference if I hang the panels on the side walls versus the back wall? Should I place panels on the walls in both positions and not worry so much about spacing them away from the wall and/or door?
Question 3: Do I need to concern myself with sealing the corner traps against the walls? How 'bout the flat panels if I choose to use them? Do I just let them have a 1-2" gap behind them?
Thanks again in advance! I'm starting with a case of (6) 2" 705-frk and a case of (6) 2" 705 plain. I figure I'll burn four sheets of each on the front corner traps, and I'll have two panels of each left over for the rear corners or wherever I should use them. I'll save up some money to buy some more if necessary...
Edits: 01/28/09Follow Ups:
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