Group delay detection threshold is 1.6-2 ms

Evidence

Others looked at the audibility of group delay: Blauert and Laws (1978), Deer et al. (1985), Bilsen and Kievits (1989), Krauss (1990), Flanagan et al. (2005), Møller et al. (2007) finding that the detection threshold is in the range 1.6 to 2 ms, and more in reflective spaces. These numbers are not exceeded by normal domestic and monitor loudspeakers. — Toole, Floyd E, Sound reproduction- the acoustics and…, 973

Categorization

• QUESTION: Worth chasing: what is the actual group delay produced by typical crossovers and box alignments, to see the margin between real design values and this threshold?