Coarse stepped approximations of continuous amplitude shading barely degrade directivity

Evidence

Keele developed approximations to the Legendre shading that both discretize the levels and truncate the extent of the shading so that practical CBT arrays can be implemented. He determined by simulation that a 3-dB stepped approximation to the shading maintained out to −12 dB did not significantly alter the excellent pattern control of a CBT line array. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2917

Categorization

• SHARE: A simulation result only a speaker-array hobbyist would savor — the 3-dB step and −12 dB cutoff are inside-baseball.