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FIG 1
ANSI S3.19-1974 Table (NRR Table)
A1: Frequency, Hz
A2: Grand Mean Attenuation, dB 19.9 22.3 27.8 30.8 38.8 44.3 50.0 46.3 42.4
A3: Standard Deviation, dB
EN 352-1:2020 Table (SNR Table)
B1: Frequency, Hz
B2: Mf (dB)
B3: sf (dB)
B4: APVf
Mean, dB
Standard Deviation, dB
Value, dB
125
250
3.7
2.9
125
250
500
17.5
21.4
26.6
4.5
2.5
2.6
13.0
18.9
24.0
SNR
H
M
31.4
36.1
28.5
1.9
2.5
1.8
30
34
27
FIG 2
500 1000 2000 3150 4000 6300 8000
2.4
2.3
3.8
1000
2000
4000
29.3
37.6
46.4
2.3
3.7
4.6
27.0
33.9
41.8
L
22.9
2.4
21
FIG 3
3.9
3.8
3.1
4.3
8000
39.6
6.8
32.8
APVf=MF-SF (dB)
NRR
CSA
25 B
B5:
SNR=30dB
H=34dB
M=27dB
L=21dB
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