Elevated microphones above 400 Hz congregate, reducing seat-related measurement anomalies

Evidence

Figure 12.15(c) shows that when the microphones were elevated to heights randomized over the range 51 to 79 inches (1.3 to 2 m) in three of the venues the curves congregate more closely to each other above about 400 Hz. Newell et al. (2015) suggest a distance of at least 2 ft (60 cm) above the back of the seat to avoid acoustical interference. It seems reasonable. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1334

Categorization

• XREF: Directly continues and resolves the measurement-anomaly theme from locations 1331-1333: the practical mitigation for seat interference is raising the microphone at least 60 cm above seat backs.