Interference pattern of correlated sources varies with both listener position and frequency

Evidence

Changing the position at which the pressure variation is observed will change the time relationships between the waves being combined. Therefore, the composite result from correlated sources is dependent on position. It will also depend on frequency because the effective phase shift caused by a time delay is proportional to frequency. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 241

Therefore, the composite result from correlated sources is dependent on position. It will also depend on frequency because the effective phase shift caused by a time delay is proportional to frequency. — David Howard, Jamie Angus, coustics and Psychoacoustics, 234

Categorization

• XREF: Explains why simply moving one’s head in a room changes which frequencies sound loud or canceled — directly relevant to the reader’s lived listening. — connects to: Echo interference creates sinusoidal power fluctuations that average to zero; Frequency response varies wildly across a hall yet listeners barely notice; Correlated sound sources add pressures while uncorrelated ones add energy (+12 more)
• corroborated: 5 independent passages support this claim — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 241; David Howard, Jamie Angus, coustics and Psychoacoustics, 234

Broader Connections

• Correlated sound sources create spatial interference patterns that uncorrelated sources do not. #expands (0.90)
• Correlated waves interfere with each other while uncorrelated sources do not #expands (0.90)
• Correlated sound sources sum to between zero and twice their individual amplitudes #expands (0.85) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 267
• Correlated source summation swings from zero to twice amplitude by frequency #expands (0.85)
• At high frequencies rooms act as irregular interference fields rather than standing-wave patterns #qualifies (0.80)
• Room mode coupling depends on source and listener positions, not frequency #contradicts (0.75)
• Room acoustics shift from standing waves to irregular interference as frequency rises #qualifies (0.72) — , Toole, Floyd E - Sound reproduction-…, 626