Wilson Electronics The Duette, Owner'S Manual, Page: 63 / 81

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W i l s o n A u d i o S p e c i a l t i e s
Acoustical comb filtering occurs when sound from a single source, such as a loud -
speaker, is directed toward a microphone or listener from a distance. The first sound
to reach the microphone is the direct sound, followed by a delayed, reflected sound.
At certain frequencies, cancellation occurs because the reflected sound lags in phase
relative to the direct sound. This cancellation is most apparent where the two frequen -
cies are 180 degrees out of phase. Further, there is augmentation at other frequencies
where the direct and the reflected sounds arrive in phase. Because it is a function
of wavelength, the comb filter effect will notch out portions of the audio spectrum at
regularly-spaced intervals. Subjectively, comb filter effect evidences itself as follows:
• Added roughness to the sound.
f
igure
15 - c
omB
f
ilter
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ffect