A line array’s −6 dB angle depends on wavelength relative to array length

Evidence

Equation A6.10 shows that the −6 dB angle depends on the ratio of the wavelength and the number of sources times the distance between them. The number of sources times the spacing between them is simply the length of the array L. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2934

Categorization

• DEFINE: Defines the key directivity metric: beamwidth as a function of wavelengths fitting into the array length.