Dense wall fabrics with empty space behind them become unwanted absorbers

Evidence

An alternative means of achieving wideband absorption is to use a large depth of porous absorber, for example one meter, and this can ­provide ­effective absorption with a flat frequency response, but at the cost of ­considerable depth. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2110 (#contradicts, via linked claim)

Categorization

• XREF: connects to: Fabric covering diffusors can triple their absorption contribution; Fabric-covered diffusers absorb sound instead of scattering it; Deep porous absorbers give flat wideband absorption at the cost of space — David Howard, Jamie Angus, coustics and Psychoacoustics, 2110 (+1 more)

Broader Connections

• Fabric-covered diffusers absorb sound instead of scattering it #exemplifies (0.88)
• Deep porous absorbers give flat wideband absorption at the cost of space #contradicts (0.75) — David Howard, Jamie Angus, coustics and Psychoacoustics, 2110
• High fiber density and generous surface area drive porous material absorption #qualifies (0.72)