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LABORATORY ATTENUATION TABLES
A:A - Headband with foam cushion
MT74H52A-110
A:1 Frequency (Hz)
A:2 Mean attenuation (dB)
A:3 Standard deviation (dB) 2.2
A:4 APV (dB)
MT74H52A-111
A:1 Frequency (Hz)
A:2 Mean attenuation (dB)
A:3 Standard deviation (dB) 2.2
A:4 APV (dB)
HT52A-112, HT52A-112-50
A:1 Frequency (Hz)
A:2 Mean attenuation (dB)
A:3 Standard deviation (dB) 2.7
A:4 APV (dB)
A:B - Headband with gel cushion
MT74H52A-110
A:1 Frequency (Hz)
A:2 Mean attenuation (dB)
A:3 Standard deviation (dB) 2.7
A:4 APV (dB)
MT74H52A-111
A:1 Frequency (Hz)
A:2 Mean attenuation (dB)
A:3 Standard deviation (dB) 2.7
A:4 APV (dB)
HT52A-112
A:1 Frequency (Hz)
A:2 Mean attenuation (dB)
A:3 Standard deviation (dB) 2.3
A:4 APV (dB)
A:C - Hard hat attachment with foam cushion
MT74H52P3E-110
A:1 Frequency (Hz)
A:2 Mean attenuation (dB)
A:3 Standard deviation (dB) 4.4
A:4 APV (dB)
MT74H52P3E-111
A:1 Frequency (Hz)
A:2 Mean attenuation (dB)
A:3 Standard deviation (dB) 4.4
A:4 APV (dB)
HT52P3E-112, HT52P3E-112-50
A:1 Frequency (Hz)
A:2 Mean attenuation (dB)
A:3 Standard deviation (dB) 3.1
A:4 APV (dB)
125 250 500 1000 2000 4000 8000 A:5 H A:5 M
14.2 21.7 34.0 35.4 35.4 33.3 35.3
1.8 2.2
2.5
12.0 19.9 31.8 32.9 32.2 30.9 32.3
125 250 500 1000 2000 4000 8000 A:5 H A:5 M
14.2 21.7 34.0 35.4 35.4 33.3 35.3
1.8 2.2
2.5
12.0 19.9 31.8 32.9 32.2 30.9 32.3
125 250 500 1000 2000 4000 8000 A:5 H A:5 M
15.0 21.6 32.9 35.5 33.5 33.2 34.1
1.9 2.0
2.1
12.3 19.7 30.9 33.4 30.7 30.5 30.6
125 250 500 1000 2000 4000 8000 A:5 H A:5 M
11.7 21.8 32.6 36.2 35.6 34.1 37.0
3.6 4.0
2.8
9.0 18.2 28.6 33.4 31.9 31.5 32.9
125 250 500 1000 2000 4000 8000 A:5 H A:5 M
11.7 21.8 32.6 36.2 35.6 34.1 37.0
3.6 4.0
2.8
9.0 18.2 28.6 33.4 31.9 31.5 32.9
125 250 500 1000 2000 4000 8000 A:5 H A:5 M
14.5 23.3 34.9 36.7 35.6 33.3 37.0
1.7 2.4
2.8
12.2 21.6 32.5 33.9 32.2 30.8 33.9
125 250 500 1000 2000 4000 8000 A:5 H A:5 M
18.2 22.4 30.0 34.0 34.9 32.4 34.2
3.6 2.9
2.5
13.8 18.8 27.1 31.5 32.2 30.5 30.2
125 250 500 1000 2000 4000 8000 A:5 H A:5 M
18.2 22.4 30.0 34.0 34.9 32.4 34.2
3.6
2.9
2.5
13.8 18.8 27.1 31.5 32.2 30.5 30.2
125 250 500 1000 2000 4000 8000 A:5 H A:5 M
17.2 21.4 30.5 33.8 35.1 30.9 34.1
2.3 2.4
4.8
14.1 19.1 28.1 29.0 32.1 29.4 28.4
32 dB 29 dB 20 d B 31 dB
3.2
2.4
3.0
32 dB 29 dB 20 d B 31 dB
3.2
2.4
3.0
31 dB 29 dB 20 dB 30 dB
2.8
2.7
3.5
33 dB 27 dB 17 dB 29 dB
3.7
2.6
4.1
33 dB 27 dB 17 dB 29 dB
3.7
2.6
4.1
33 dB 30 dB 21 dB 31 dB
3.4
2.5
3.1
32 dB 28 dB 21 dB 30 dB
2.7
1.9
4.0
32 dB 28 dB 21 dB 30 dB
2.7
1.9
4.0
31 dB 28 dB 21 dB 29 dB
3.0
1.5
5.7
EN 352-1:2002
A:5 L
SNR
MT74H52A-110
292 g
A:5 L
SNR
MT74H52A-111
300 g
A:5 L
SNR
HT52A-112
273 g
HT52A-112-50
275 g
EN 352-1:2002
A:5 L
SNR
MT74H52A-110
351 g
A:5 L
SNR
MT74H52A-111
359 g
A:5 L
SNR
HT52A-112
332 g
EN 352-3:2002
A:5 L
SNR
MT74H52P3E-110
243 g
A:5 L
SNR
MT74H52P3E-111
251 g
A:5 L
SNR
HT52P3E-112
224 g
HT52P3E-112-50
226 g
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