EN 352-4; EN 352-6; EN 352-8
EN 352-1:2020 SNR:29dB
ANSI S3.19-1974 Attenuation data
NRR:24dB
AS/NZS SLC(80): 27.1dB
Class 5
| Test frequentcies (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
| Mean attenuation (dB) | 17.9 | 20.0 | 24.9 | 33.1 | 31.5 | 39.0 | 40.9 |
| Standard Deviation(dB) | 2.7 | 2.4 | 2.8 | 3.4 | 3.0 | 3.5 | 3.1 |
| Mean-minus-Std. dev.dB/APV | 15.2 | 17.6 | 22.1 | 29.8 | 28.5 | 35.5 | 37.8 |
| SNR=29dB | H= 31 dB | M= 26 dB | L= 20 dB |
| SNR 30.6dB | Hm = 33.7dB | Mm = 28.2dB | Lm = 22.6dB |
| SNR = 1.8dB | H₁ = 2.4dB | M₁ = 2.0dB | L = 2.2dB |