Tests
2
Effect of Insulation
Rw range
7–13dB
spread 6 dB
Highest Rw
13dB
GW 45 mm R2.5
Largest ΔRw vs first
+7dB
GW 45 mm R2.5
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 | |
|---|---|---|---|---|---|---|---|---|
| No Insulation | Project010 | 7 | 0 | 0 | ref. | +7 | 7.6 | |
| GW 45 mm R2.5 | Project011 | 13 | 0 | −1 | +7 | +13 | 12.3 |
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.