A 0–30 ms gap before first reflections cues spatial size while avoiding echoes

Evidence

A gap between the direct sound and first reflections. This happens naturally in most spaces and gives a cue as to the size of the space. The gap should not be too long—less than 30 ms—or the early reflections will be perceived as echoes. Some delay, however, is desirable, as it gives some space for the direct sound and so improves the clarity of the sound, but a shorter gap does add “intimacy” to the space. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2274

Categorization

• QUESTION: Could explore how the delay-to-intimacy tradeoff maps onto recording techniques versus natural listening in different rooms.