February 2016
Intermediate to advanced
216 pages
14h 38m
English
Content preview from Newnes Audio and Hi-Fi Engineer's Pocket Book, 3rd Edition
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38
75
50
25
ι
0-
-25 -
Λ,
Resonant
frequency
Frequency
dB-50L-
Sound
reduction
Figure
33.
Sound
reduction
curves
of a floating floor. Low
damping
gives
best
results
above
resonance
but worst
below
it. It should therefore be
used
with a low
resonant
frequency
of
below
20
Hz.
resonance frequency owing to the low mass of the glass. Exact
figures depend on weight and size but a 4 inch gap is about the
optimum, though this is too large for good thermal insulation.
Normal gaps of around 7
2
inch produce resonances in the
region of 300 Hz which reduce the sound insulation at that
point. Damping the resonance by putting absorbent material
within the cavit ...
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