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2 . 4 — Y
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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
Occasionally, however, there is just enough resonance to give a little added warmth
to the sound—an addition some listeners prefer. Careful placement of loudspeakers in
the room can dramatically reduce the speakers’ destructive interaction with low fre-
quency modes. ASC Tube Traps™ are effective in reducing some of this low frequency
room coloration. Custom designed bass traps, such as perforated Helmholtz resonators,
provide the greatest degree of low frequency control.
Section 2.4—Your Room
Room Shapes
Standing waves are pressure waves propagated by the interaction of sound and op-
posing parallel walls. This interaction creates patterns of low and high acoustical pres-
sure zones that accentuate and attenuate particular frequencies. Those frequencies are
dependent on room size and dimension.
There are three basic shapes for most rooms: square, rectangular, and L-shaped (see
Figure 4).
A perfectly square room is the most difficult room in which to set up speakers.
By virtue of its shape, a square room is the perfect medium for building and sustaining
standing waves. These rooms heavily influence the music played by loudspeakers, greatly
diminishing the listening experience.
Long, narrow, rectangular rooms also pose their own special acoustical problems
for speaker setup. They have the ability to create several standing wave nodes, which
will have different standing wave frequency exaggerations depending on where you are
sitting. Additionally, these long rooms are often quite lean in the bass near the center of
the room. Rectangular rooms are still preferred to square rooms because, by having two
sets of dissimilar length walls, standing waves are not as strongly reinforced and will
dissipate more quickly than in a square room. In these rooms, the preferred speaker po-