Spatial averaging reveals boundary effects hidden by standing waves

Evidence

The effects of room boundary interactions are in all room curve measurements, but in any individual one they may be obscured by other factors, such as standing waves. However, by averaging several room curves, measured at different locations—a spatial average—the effects of the position-dependent variations are reduced, and evidence of the underlying adjacent-boundary effects is more clearly seen. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1467