Fiberglass reflection depends on angle and frequency, not density

Evidence

Figures 12.21 and 12.22 show that the sound reflected from a flat fiberglass panel is both angle and frequency dependent. Figure 12.23 confirms this from a different perspective. Incidentally, these two measurements happened to use different densities of fiberglass, but as mentioned earlier, absorption changes little with differences in density. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1377

Categorization

• XREF: Reinforces location 1370’s density-independence claim, this time cross-validated by two independent measurements. — connects to: Fiberglass density barely affects absorption but strongly affects mechanical strength — Toole, Floyd E, Sound reproduction- the acoustics and…, 1370; Reflection from a bumpy surface depends on bump height relative to wavelength. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2120; Whether a surface reflects specularly or diffusely depends on wavelength, not polish — Eric J. Heller, Why You Hear What You Hear- An…, 170 (+3 more)
• yield-rescued: below the book’s yield-target cutoff, included anyway for connecting to: Fiberglass density barely affects absorption but strongly affects mechanical strength — Toole, Floyd E, Sound reproduction- the acoustics and…, 1370; Reflection from a bumpy surface depends on bump height relative to wavelength. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2120; Whether a surface reflects specularly or diffusely depends on wavelength, not polish — Eric J. Heller, Why You Hear What You Hear- An…, 170 (+3 more)

Broader Connections

• Fiberglass density barely affects absorption but strongly affects mechanical strength #complicates (0.78) — Toole, Floyd E, Sound reproduction- the acoustics and…, 1370