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