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@tmuikku: It's not that complicated really, a mode is roughly a planar wavefront, and it always has a major dimension and direction in space. A primary mode is between two surfaces, higher order modes can be between two corners. That flat planar wave is why it's a "mode", at least the way I...

@daftcombo: Then you have a 40Hz resonance between the listening room and the general "outer space" outside that corridor.... That resonance could be either acoustical or mechanical (structural). No matter which, any brick wall filter can/will sound strange in some circumstances. Sorry, can't...

Judging by the pictures of the room, I'd be willing to bet that most, almost all of the L/R phasing problem for mid-bass would go away if you didn't have that hallway in the entrance to the room. The "left" speaker sees a much longer diagonal primary than the "right" speaker does, even if...

I've never trusted the straight output of REW when it comes to in room phase (long term, close to steady state amplitude-to-phase calculations). Understand me correctly here, I don't think the continuous amplitude-phase theorem is wrong! I just think that when you trust amplitude sweeps that are...