Specular reflections produce audible comb filtering and false source images

Evidence

It is important that these reflections be diffuse, as specular reflections will result in disturbing comb filter effects, as discussed in Chapter 1, and distracting images of the sound sources in unwanted and unusual directions. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1927

Categorization

• XREF: Explicitly builds on the comb filter treatment in Chapter 1; the reader already has that mechanism from earlier in the book.