Wilson Audio WATCH Dog Subwoofer Series-2 - Manual (Page 20)

20
the reflected sounds arrive in phase. Because it is a function of wave length, the comb
filter effect will notch out portions of the audio spectrum at regular octave-spaced
intervals.
The subjective effect of comb filter effects (such as is shown in Figure 3) is as
follows:
• Added roughness to the sound
• Reduction of harmonic richness
• Smearing of lateral sound stage image focus and placement
Comb filter effects are usually caused by side wall reflections. They are best
controlled by very careful speaker placement and by the placement of Sonex or air
Figure 3