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B:A - Headband with foam cushion - NA
MT74H52A-110
B:1 Frequency (Hz)
B:2 Mean attenuation (dB)
B:3 Standard deviation (dB) 2.2
MT74H52A-111
B:1 Frequency (Hz)
B:2 Mean attenuation (dB)
B:3 Standard deviation (dB) 2.2
HT52A-112, HT52A-112-50
B:1 Frequency (Hz)
B:2 Mean attenuation (dB)
B:3 Standard deviation (dB) 2.8
B:B - Hard hat attachment with foam cushion - NA
MT74H52P3E-110
B:1 Frequency (Hz)
B:2 Mean attenuation (dB)
B:3 Standard deviation (dB) 3.3
MT74H52P3E-111
B:1 Frequency (Hz)
B:2 Mean attenuation (dB)
B:3 Standard deviation (dB) 3.3
HT52P3E-112, HT52P3E-112-50
B:1 Frequency (Hz)
B:2 Mean attenuation (dB)
B:3 Standard deviation (dB) 3.1
B:C - Neckband with foam cushion - NA
MT74H52B-110
B:1 Frequency (Hz)
B:2 Mean attenuation (dB)
B:3 Standard deviation (dB) 2.6
MT74H52B-111
B:1 Frequency (Hz)
B:2 Mean attenuation (dB)
B:3 Standard deviation (dB) 2.6
HT52B-112
B:1 Frequency (Hz)
B:2 Mean attenuation (dB)
B:3 Standard deviation (dB) 3.0
125
250
500 1000 2000 3150
19.2 20.6
31.4 39.8
1.8
2.4
2.7
125
250
500 1000 2000 3150
19.2 20.6
31.4 39.8
1.8
2.4
2.7
125
250
500 1000 2000 3150
19.4 22.1
30.9 39.8
2.3
2.9
2.5
125
250
500 1000 2000 3150
19.3 20.2
30.1 35.3
2.6
3.4
2.8
125
250
500 1000 2000 3150
19.3 20.2
30.1 35.3
2.6
3.4
2.8
125
250
500 1000 2000 3150
21.1 21.6
32.4 36.4
2.8
2.9
3.7
125
250
500 1000 2000 3150
16.1 20.2
28.5 34.1
2.4
3.1
3.1
125
250
500 1000 2000 3150
16.1 20.2
28.5 34.1
2.4
3.1
3.1
125
250
500 1000 2000 3150
18.2 20.9
30.3 36.5
2.2
2.6
3.1
4000
6300
38.1
32.8
34.2
37.2
3.1
2.4
2.8
2.5
4000
6300
38.1
32.8
34.2
37.2
3.1
2.4
2.8
2.5
4000
6300
38.2
33.3
35.6
36.7
3.1
2.7
2.4
2.6
4000
6300
37.5
34.4
34.8
37.6
3.7
3.0
3.0
3.3
4000
6300
37.5
34.4
34.8
37.6
3.7
3.0
3.0
3.3
4000
6300
39.2
32.0
35.3
35.5
3.1
2.8
3.4
2.6
4000
6300
38.8
33.2
34.3
37.1
2.5
2.5
2.5
3.0
4000
6300
38.8
33.2
34.3
37.1
2.5
2.5
2.5
3.0
4000
6300
38.6
31.5
33.7
36.5
2.4
2.8
2.4
2.6
ANSI S3.19-1974
8000
NRR
CSA
Class
37.7
26
2.6
A
8000
NRR
CSA
Class
37.7
26
2.6
A
8000
NRR
CSA
Class
36.9
26
3.2
A
ANSI S3.19-1974
8000
NRR
CSA
Class
MT74H52P3E-110
37.8
24
3.0
A
8000
NRR
CSA
Class
37.8
24
3.0
A
8000
NRR
CSA
Class
36.5
25
3.8
BL
ANSI S3.19-1974
8000
NRR
CSA
Class
36.9
24
3.0
A
8000
NRR
CSA
Class
36.9
24
3.0
A
8000
NRR
CSA
Class
38.6
25
2.7
B
MT74H52A-110
292 g
MT74H52A-111
300 g
HT52A-112
273 g
HT52A-112-50
275 g
243 g
MT74H52P3E-111
251 g
HT52P3E-112
224 g
HT52P3E-112-50
226 g
MT74H52B-110
275 g
MT74H52B-111
282 g
HT52B-112*
256 g
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