Room acoustical behavior changes across a broad transition region, not at one frequency
Evidence
The room curves displayed in Chapter 5 show that the right combination of anechoic measurements can closely anticipate events in typical rooms at middle and high frequencies, but at low frequencies the curves are lumpy and irregular. The acoustical explanation is the dominance of relatively isolated room modes and associated standing waves at low frequencies, and of a complex collection of overlapping modes and reflected sounds at high frequencies. As a result, as frequency increases it becomes progressively less useful to think about regular patterns of standing waves in rooms, but rather to think in terms of irregular patterns of constructive and destructive acoustical interference caused by numerous reflections traveling in many directions. — , Toole, Floyd E - Sound reproduction-…, 626 (
#corroborates, via linked claim)
Categorization
- XREF: connects to: Wood’s anisotropy makes sound radiation direction- and frequency-dependent; Room resonances shift from isolated to overlapping at the Schroeder frequency; Frequency response varies wildly across a hall yet listeners barely notice (+8 more)
Broader Connections
- Room acoustics shift from standing waves to irregular interference as frequency rises
#corroborates(0.88) — , Toole, Floyd E - Sound reproduction-…, 626 - Room mode coupling depends on source and listener positions, not frequency
#contradicts(0.80) - Room effects minimally influence steady-state response above 1 kHz
#contradicts(0.78) - Room reverberation time varies with frequency, altering perceived timbre
#expands(0.75) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1876 - Room size in acoustics is defined by critical frequency relative to generated sound
#expands(0.72) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2027