Dimensionally symmetrical rooms are acoustically asymmetrical due to construction details

Evidence

Here are shown, using an expanded frequency scale, high-resolution frequency-response measurements from each of the five loudspeakers in a surround-sound system at the prime listening position. The room is geometrically symmetrical, but differences in the curves reveal that it is not acoustically symmetrical. A door in one end wall causes it to flex more than the other one at certain frequencies, and a concrete wall behind, but not touching, one of the side walls gives it more stiffness than the opposite wall. The result is asymmetry in the standing wave patterns. — , Toole, Floyd E - Sound reproduction-…, 631

Categorization

• XREF: Connects to the reader’s soundscape work: how room construction details (door flex, wall stiffness) shape what a listening space actually conveys. — connects to: Avoiding commensurate room dimensions prevents overlapping modal frequencies that cause acoustic problems; Room modal frequencies depend on the number of opposing surfaces; Room modes are determined by the linear dimensions of opposing surfaces (+3 more)
• corroborated: 2 independent passages support this claim — , Toole, Floyd E - Sound reproduction-…, 631

Broader Connections

• Avoiding commensurate room dimensions prevents overlapping modal frequencies that cause acoustic problems #qualifies (0.85)
• Room modes are determined by the linear dimensions of opposing surfaces #complicates (0.80)
• The ideal room ratio dogma originated from industrial reverberation chambers, not listening rooms #qualifies (0.80) — , Toole, Floyd E - Sound reproduction-…, 900
• Room modal frequencies depend on the number of opposing surfaces #complicates (0.75)
• The diffuse field assumption underpins room acoustics predictions but fails at low frequencies #corroborates (0.75)
• Spatially static resonant modes cause sound level to vary across a room #expands (0.72) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1953