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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 , I N C .
Resonance in listening rooms is generally caused by two sources:
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Structures within the listening room
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The volume of the air itself in the listening room
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TRUCTURAL
R
ESONANCE
Structural resonance’s are familiar to most people as buzzes and rattles, but this type of resonance
usually only occurs at extremely high volume levels, and is usually masked by the music. In many wood
frame rooms the most common type of structural resonance problem is “booming” of walls and floors. You
can test for these very easily by tapping the wall with the palm of your hand or stomping on the floor. To
give you an idea of what the perfect wall would sound like, imagine rapping your hand against the side of
a mountain. Structural wall resonance’s generally occur in the low to mid-bass frequencies and add tonal
balance fullness to any system played in that room. They too are more prominent at louder levels, but
their contribution to the sound of the speaker is more progressive. Rattling windows, picture frames, lamp
shades, etc. can generally be silenced with small pieces of caulk or with blocks of felt. However, short of
actually adding additional layers of sheet rock to flimsy walls, there is little that can be done to eliminate
wall resonance’s.
A
IR
V
OLUME
R
ESONANCE
The volume of air in a room will also resonate at a frequency determined by the size of the
room. Larger rooms will resonate at a lower frequency than will smaller rooms. Air volume res-
onanceʼs, wall panel resonanceʼs, and low frequency standing waves, together, combine to form
a low frequency coloration in the sound. At its worst, it is a grossly exaggerated fullness, which
tends to obscure detail and distort the natural tonal balance of the speaker system.
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