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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.
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.
The following tables give the maximum recommended gap (between WLX/WLXGS sides) for the relevant
frequency range.
Gap Smooth coverage range
0.0m 38 - 160Hz
0.5m 38 - 115Hz
1.0m 38 - 86Hz
2.0m 38 - 60Hz
To avoid combing...
Keeps gaps below 0.2m.
All material © 2007. Martin Audio Ltd. Subject to change without notice.