Standing waves from room boundaries prevent diffuse sound fields at low frequencies.

Evidence

Although at mid and high audio frequencies a diffuse field might be possible, either by accident or design, at low frequencies this is not the case due to the effect of the room’s boundaries causing standing waves. — David Howard, Jamie Angus, coustics and Psychoacoustics, 1989

Categorization

• XREF: Connects to the reader’s ongoing work on why rooms sound different at bass vs treble, and to the general psychoacoustics theme of physical space shaping perceived sound.