ΙΙΙ
67
✻✻
072
✻✻
Sound pressure level (dB, ref.2xE-5)
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
63
125
250
500
1000
4000
2000
8000
NC-65
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
NC-15
Octave band center frequency(Hz)
High
Low
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