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Rattling windows, picture frames, lamp shades, etc., can generally be silenced with
small pieces of caulk or with blocks of felt. Short of actually adding additional lay-
ers of sheet rock or book shelves to flimsy walls, however, there is little that can be
done to eliminate wall resonances.
A i r V o l u m e R e s o n a n c e
The physical dimensions and volume of air in a room will also support
standing wave modes and resonances at a frequencies determined by the size of the
room. Larger rooms will resonate at a lower frequency and have more complex
(better) modal distributions than will smaller rooms. Air volume resonances, wall
panel resonances, and low frequency standing waves, together, combine to form a
low frequency coloration in the sound. At its worst, it is a grossly exaggerated full-
ness, which tends to obscure detail and distort the natural tonal balance of the
speaker system. Occasionally, however, there is just enough resonance to give a lit-
tle added warmth to the sound, an addition some listeners prefer. Careful place-
ment of loudspeakers in the room can dramatically reduce the speakers' destructive
interaction with low frequency modes. ASC Tube Traps™ have been found to be
effective in reducing some of these low frequency room colorations. Custom
designed and constructed bass traps, such as perforated Helmholtz resonators, pro-
vide the greatest degree of low frequency control.
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