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• It adds harshness to the upper midrange and treble by storing time-domain
smearing energy.
• It destroys the delicate phase relationships, which help to establish an ac-
curate soundstage.
Slap echo (see Figure 3) is a common acoustical problem in the typical domestic lis-
tening room because most of these rooms have walls with a hard, reflective nature, only
occasionally interrupted by curtains, wall art, or drapes. The best (but least practical)
solution to eliminate slap echo is nonparallel walls. This is because, rather than support
slap-echo, nonparallel walls allow the sound to dif fuse. This approach can be accounted
for during the construction process. For existing rooms, slap echo can also be controlled
entirely by the application of absorptive materials to the hard surfaces. These are absorp-
F
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IGURE
OMMON
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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
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ROBLEMS
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