Wilson Audio WATCH Dog Subwoofer Series-2 - Manual (Page 22)

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its worst, the result is a grossly exaggerated fullness which tends to obscure detail
and distort the natural tonal balance of the speaker system. Occasionally, however, a
small-amplitude resonance can add a desirable warmth to the sound - an addition
some listeners prefer. Tube traps, manufactured by the ASC corporation, have been
found to be effective in reducing some low frequency room colorations. Custom
designed and constructed bass traps, such as perforated Helmholtz resonators, pro-
vide the greatest degree of low frequency control.