Front wall: 12 feet
Back wall: 16 feet
Splayed side walls: 16 feet each,
Ceiling height: mostly 8 feet, except for boxed out ducts in back
Ordinarily I would stay away from multiples, but in this case I didn't see a problem because the soffits in my original plan use sheetrock facing, so I considered the front of the soffits as the boundary of the room, giving the room average dimensions of 14 feet wide and 15 feet long. While these aren't "golden dimensions", the modes actually look pretty good, with each axial mode below 200 Hz at least 6.9% away from the next one.
So now I've got two big questions:
1) If I make the soffits NOT of rigid sheetrock, but I use the design you posted, which is mostly insulation and flexible diaphragms, then the soffits should no longer be calculated into the room dimensions, right? If they no longer form the room boundary, then the room really is 16 feet long, exactly double the height, opening a can of worms for room modes. Or does your speaker soffit design with all its absorption have the effect of making the room corners acoustically invisible and the room dimensions irrelevant? 2) To avoid a potential modal problem, I'm thinking of dramatically altering my existing plan by creating the new area shown in red, that is, I could eat into some of the office space behind the control room back wall to make room for a slat resonator back there about the size of a phone booth, using your systems of insulation hangers in there. This would make the office space a little weird, but having an excellent acoustic environment in the control room is far more important to me. Would adding the slat resonator back there make much of a difference? Or is there some other way to achieve the same result without "ruining" the office? I could nix the open-back bookshelf from the plan, and replace it with a couch on the floor with an angled 4 foot by 4 foot diaphragmatic absorber going from the wall to the ceiling above it. What would you do?Thanks in advance for your advice. You're really doing a terrific service to everyone with your site.
Lee