Room modal bandwidths depend on decay time, not frequency

Evidence

Note that, if the absorption remains constant with frequency, the bandwidths of a mode are independent of their frequency—they are simply a function of the modal decay time. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2012

Categorization

• DEFINE: States the bandwidth-decay relationship central to modal analysis.
• corroborated: 2 independent passages support this claim — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2012
• XREF: connects to: The uncertainty principle relates resonance width to decay time; A single slope measurement of dB decay directly yields the reverberation time; A transition frequency separates modal from ray acoustical behavior in rooms — Toole, Floyd E, Sound reproduction- the acoustics and…, 475 (+6 more)

Broader Connections

• Modal decay analysis governs room acoustics below the critical frequency #expands (0.80) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2038
• Room absorption shrinks mode bandwidth and flattens standing wave peaks #corroborates (0.80)
• A room mode’s length relative to mean free path sets its decay time #qualifies (0.75)