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19
10
20
30
40
50
60
70
80
0
0
0
8
0
0
0
4
0
0
0
2
0
0
0
1
0
0
5
0
5
2
5
2
1
A5DB200H2
NC70
NC45
NC50
NC55
NC60
NC65
NC20
NC25
NC30
NC35
NC40
H
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20
μ
Pa)
A5DB250H2
0
10
20
30
40
50
60
70
125
250
500
1000
2000
4000
8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20
μPa)
NC-20
NC-30
NC-25
NC-35
NC-40
NC-45
NC-50
NC-55
H