1
2
3
Frequency [Hz]
125
250
500
1000 2000
3150
4000
6300
8000
NRR
CSA
Class
MT7H7A4600-NA
Head band
Mean Attenuation [dB]
17.8
23.0
32.1
36.2
35.1
39.0
38.7
38.3
36.5
25
A
Standard Deviation [dB]
4.4
3.2
2.8
3.0
2.4
3.8
3.0
3.5
3.9
MT7H7B4600-NA
Neck band
Mean Attenuation [dB]
18.9
25.9
35.2
37.0
34.9
40.6
39.9
39.7
39.7
26
A
Standard Deviation [dB]
5.2
3.2
3.3
2.9
2.5
3.6
3.0
2.3
2.5
MT7H7P3E4600-NA
Helmet attachment
Mean Attenuation [dB]
19.4
24.3
33.6
35.5
34.1
38.5
38.0
35.8
35.7
25
A
Standard Deviation [dB]
3.4
3.3
3.8
1.7
2.6
3.6
3.1
5.4
5.4
(K) Attenuation
ANSI S3.19-1974
1
. 67.0
8.
88.5
15.
110.9
22.
141.3
29.
179.9
36.
233.6
2.
71.9
9.
91.5
16.
114.8
23.
146.2
30.
186.2
37.
241.8
3.
74.4
10.
94.8
17.
118.8
24.
151.4
31.
192.8
38.
250.3
4.
77.0
11.
97.4
18.
123.0
25.
156.7
32.
203.5
5.
79.7
12.
100.0
19.
127.3
26.
162.2
33.
210.7
6.
82.5
13.
103.5
20.
131.8
27.
167.9
34.
218.1
7.
85.4
14.
107.2
21.
136.5
28.
173.8
35.
225.7
(I) CTCSS (Continuous Tone Coded Squelch System)
(J)
(L) Weight
Z3G
Z3K
Z3E
MT53H7A4600-NA
13.9 oz. (394 g)
M753H7B4600-NA
13.5 oz. (384 g)
MT53H7P3E4600-NA 14.7 oz. (418 g)
(M) Helmet attachments
