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S
S
2 O
O P H I A
E R I E S
Comb filter effects are often caused by side wall reflections. They are best
controlled by very careful speaker placement and by the judicious placement of
Illbruck Sonex® or air duct panels applied to that part of the wall where the reflec-
tion occurs.
S e c t i o n 2 . 1 - R e s o n a n c e
Resonance in listening rooms are generally caused by two sources:
•
The structures within the listening room
•
The volume of the air itself in the listening room
S t r u c t u r a l R e s o n a n c e
Structural resonances 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 heel of your hand or stomping on the
floor. If it is a wooden floor, this is done to detect the primary spectral center of
the resonance. 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 reso-
nances 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 loud-
er levels, but their contribution to the sound of the speaker is more progressive.
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