Tests
2
Effect of Open Area
Rw range
12dB
spread 0 dB
Highest Rw
12dB
SM 1.6 mm Round (11.0%)
Largest ΔRw vs first
±0dB
SM 2.38 mm Round (23.0%)
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 | |
|---|---|---|---|---|---|---|---|---|
| SM 1.6 mm Round (11.0%) | Project040 | 12 | −1 | −2 | ref. | +12 | 10.4 | |
| SM 2.38 mm Round (23.0%) | Project045 | 12 | −1 | −2 | ±0 | +12 | 10.4 |
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.