changed dramatically around the sides. There are now strong lobes at the sides
because the spacing is now an even number of half-wavelengths at this particular
frequency. These lobes could cause low frequency feedback problems on stage with
the high microphone gains used for orchestral low string (cello, double bass) sections
or for “unplugged” performances.
60Hz
At 60Hz the spacing is an odd number of half-wavelengths again so we see side nulls
again.
40Hz
When the frequency drops to 40Hz, the 8.6m spacing = 1 wavelength.
Again, the central response is maintained but there is a dip in response over wide
areas either side of the centre. The spacing is an even number of half-wavelengths
again so we see side lobes again.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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