Source and receiver placement effects on modes occur at all frequencies

Evidence

To summarize, the net effect of the mode at or near the modal frequency depends on the positions of both source and receiver, and each mode is different. These spatial effects are independent of frequency, i.e. they occur at all frequencies for a given mode. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1529

Categorization

• XREF: Connects to why listener/speaker positioning (the placement debate in room acoustics) shifts response everywhere, not just at resonance peaks.