Tests
5
Effect of Open Area
Rw range
14–20dB
spread 6 dB
Highest Rw
20dB
PB Slots (13.1%)
Largest ΔRw vs first
+4dB
PB Slots (13.1%)
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%) | Project006 | 14 | 0 | −2 | ref. | +14 | 13.5 | |
| PB Slots (13.1%) | Project027 | 20 | 0 | −2 | +4 | +20 | 18.4 | |
| PB 12 mm Round (17.7%) | Project020 | 19 | 0 | −2 | +3 | +19 | 17.4 | |
| PB 15 mm Round (19.6%) | Project018 | 19 | −1 | −3 | +2 | +18 | 16.6 | |
| PB 12 mm Hexagon (23.9%) | Project033 | 20 | −1 | −3 | +3 | +19 | 17.5 |
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.