Tests
2
Effect of Hole Diameter
Rw range
30–36dB
spread 6 dB
Highest Rw
36dB
PB 15 mm Round (19.6%)
Largest ΔRw vs first
+2dB
PB 15 mm Round (19.6%)
Sound reduction index
R′ from the 2270, re-referenced to the 0.9216 m² specimen area (−0.35 dB). Grey lines: reference bounds.
Single-number ratings
Open in explorer| Varies | Test | Rw | C | Ctr | ΔRw vs first | ΔRw vs open | Mean R | |
|---|---|---|---|---|---|---|---|---|
| PB 6 mm Round (No Scrim) (10.4%) | Project058 | 30 | −2 | −6 | ref. | +29 | 28.2 | |
| PB 15 mm Round (19.6%) | Project057 | 36 | −2 | −6 | +2 | +35 | 31.8 |
Rw, C and Ctr per ISO 717-1 over 100–3150 Hz. ΔRw fits the reference curve to the band-by-band difference curve, which is not the same number as subtracting two separately rounded Rw values. Mean R is the arithmetic mean over the 16 rating bands.