The following formula gives the pressure ratio p(h) (wrt to the on-axis pressure) for
any off-axis angle of a regularly spaced linear array:
Far field polar patterns can be quite complicated - even for a simple pair of
subwoofers driven in unison.
Wide spacing will cause off axis irregularities (combing) because time offsets start to
become significant. See Section 4.10 for a more detailed explanation.
♦ An odd number of half wavelengths will cause nulls along the line of the
loudspeakers (the 90º lines) - see the 2½ wavelength example above.
♦ An even number of half wavelengths will cause lobes along the line of the
loudspeakers - see the 2 wavelength example below.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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