Laboratory Attenuation Tables
EN 352-1:2002 / EN 352-3:2002 / EN 352-4:2001+A1:2005 / EN 352-6:2002 / EN 352-8:2008
Headband with foam cushion
MT15H7AWS6**
(A:1)
A
A:1 Frequency (Hz) 125 250 500 1000 2000 4000 8000 A:5 H A:5 M A:5 L SNR
A:2 Mean attenuation (dB) 14.4 24.6 35.8 36.0 34.3 35.0 34.8
33 30 20 31 373 g
A:3 Standard deviation
(dB)
3.1 1.8 3.2 2.7 2.3 3.0 3.4
A:4 APV (dB) 11.3 22.8 32.6 33.3 32.0 32.0 31.4
EN 352-1:2002
(A6)
Helmet attachment with foam cushion
MT15H7P3EWS6**
(A:1)
A:1 Frequency (Hz) 125 250 500 1000 2000 4000 8000 A:5 H A:5 M A:5 L SNR
A:2 Mean attenuation (dB) 18.7 25.4 33.0 38.0 34.3 34.4 34.3
31 30 23 31 395 g
A:3 Standard deviation
(dB)
3.2 3.4 3.3 4.5 3.8 3.6 5.0
A:4 APV (dB) 15.5 22.0 29.7 33.5 30.5 30.8 29.3
EN 352-3:2002
(A6)
Headband with gel cushion
MT15H7AWS6**
(A:1)
A:1 Frequency (Hz) 125 250 500 1000 2000 4000 8000 A:5 H A:5 M A:5 L SNR
A:2 Mean attenuation (dB) 15.2 23.6 36.1 37.1 34.9 38.0 37.4
34 31 22 32 432 g
A:3 Standard deviation
(dB)
1.9 1.7 2.7 2.2 2.5 2.7 3.3
A:4 APV (dB) 13.3 21.9 33.4 34.9 32.4 35.3 34.1
EN 352-1:2002
(A6)
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
18.6 27.4 35.9 38.9 35.8 37.7 37.0 36.4 38.0
26 A 373 g
Std deviation (dB)
(B:3)
4.1 3.3 3.1 2.9 2.9 3.0 2.4 3.8 5.0
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
17.3 24.3 33.4 35.9 35.0 37.8 37.0 37.7 39.8
24 A 357 g
Std deviation (dB)
(B:3)
4.4 4.6 3.7 3.0 3.1 2.4 2.6 2,.6 3,9
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
19.3 25.1 35.0 38.7 34.5 35.3 34.9 36.1 38.5
26 A 395 g
Std deviation (dB)
(B:3)
3.6 2.9 3.1 2.1 2.5 2.1 2.4 2.8 4.1
Helmet attachment gel cushion
MT15H7P3*WS6**
(A:1)
A:1 Frequency (Hz) 125 250 500 1000 2000 4000 8000 A:5 H A:5 M A:5 L SNR
A:2 Mean attenuation (dB) 18.0 23.1 32.1 37.6 35.1 35.1 36.7
32 29 21 31 457 g
A:3 Standard deviation
(dB)
2.2 4.4 3.9 2.7 3.5 2.7 5.7
A:4 APV (dB) 15.8 18.7 28.2 34.9 31.6 32.4 31.0
EN 352-:2002
(A6)
Neckband with foam cushion
MT15H7BWS6**
(A:1)
A:1 Frequency (Hz) 125 250 500 1000 2000 4000 8000 A:5 H A:5 M A:5 L SNR
A:2 Mean attenuation (dB) 14.3 24.7 34.7 35.3 36.1 37.1 37.4
35 30 21 32 365 g
A:3 Standard deviation
(dB)
2.0 1.9 2.3 2.7 2.2 2.2 3.1
A:4 APV (dB) 12.3 22.8 32.4 32.6 33.9 34.9 34.3
EN 352-1:2002
(A6)
Neckband with gel cushion
MT15H7B*WS6**
(A:1)
A:1 Frequency (Hz) 125 250 500 1000 2000 4000 8000 A:5 H A:5 M A:5 L SNR
A:2 Mean attenuation (dB) 14.5 22.5 34.5 36.5 37.5 37.8 37.3
36 29 20 32 425 g
A:3 Standard deviation
(dB)
3.4 2.0 2.6 2.3 2.7 2.5 2.9
A:4 APV (dB) 11.1 20.5 31.9 34.2 34.8 35.3 34.4
EN 352-1:2002
(A6)
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
17.5 23.3 34.6 39.2 36.1 38.2 38.5 38.7 40.0
27 A 457 g
Std deviation (dB)
(B:3)
2.6 2.0 3.2 2.8 2.7 2.6 2.1 1.9 2.5
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
16.9 22.5 33.4 39.9 35.2 37.6 36.1 36.7 37.5
27 A 432 g
Std deviation (dB)
(B:3)
2.6 2.2 2.5 1.8 1.9 1.7 2.6 1.8 1.7
Frequency (Hz)
(B:1)
125 250 500 1000 2000 3150 4000 6300 8000 NRR
CSA
Class
Mean attenuation (dB)
(B:2)
16.6 22.6 32.3 37.7 37.6 38.7 37.8 39.5 40.3
26 A 425 g
Std deviation (dB)
(B:3)
3.6 2.2 2.4 2.4 2.8 2.9 2.5 2.4 2.0