Filter
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IV
49
✻✻
060
✻✻
Sound pressure level (dB, ref.2xE-5)
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
63 125 250 500 1000 40002000 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 freqency(Hz)
Front
Back
✻✻
080/100
✻✻
Sound pressure level (dB, ref.2xE-5)
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
63 125 250 500 1000 40002000 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 freqency(Hz)
Front
Back
DVM E-D/B(chapter4-2)-E<03759 3/21/02 7:40 PM Page 49