Membrane absorbers deliver wide-band absorption in only 30 cm of depth.

Evidence

These rooms require wide-band absorbers, as shown in Figure 7.27. These absorbers can take up a considerable amount of space. As one can see in Figure 7.27, the absorbers can occupy more than 50% of the volume. However, it is possible to use wide-band membrane absorbers, as discussed in Chapter 6, with a structure similar to that shown in Figure 6.48 with a limp membrane in place of the perforated sheet. Using this type of absorber, it is possible to achieve sufficient wide-band absorption with a depth of 30 cm, which allows this technique to be applied in much smaller rooms whose area is approximately 15 m2. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2313

Categorization

• XREF: Directly references Chapter 6’s membrane absorber construction but swaps the perforated sheet for a limp membrane. — connects to: Wide-band membrane absorbers shrink non-environment rooms to fifteen square meters — David Howard, Jamie Angus, coustics and Psychoacoustics, 2295