The Master Handbook of Acoustics, Fourth Edition
By F. Alton Everest

Effect of Airspace Behind Absorbent

Low-frequency absorption can also be improved by spacing the absorbent out from the wall. This is an inexpensive way to get improved performance-within limits. Figure 9-9 shows the effect on the absorption coefficient of furring 1-inch glass-fiber wallboard out from a solid wall. Spacing 1-inch material out 3 inches makes its absorption approach that of the 2-inch material of Fig. 9-8 mounted directly on the wall.


Figure 9-9: The low-frequency absorption of 1-inch glass fiberboard is improved materially by spacing it out from the solid wall.
Copyright The McGraw-Hill Companies, Inc. 2001 under license agreement with Books24x7
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