49
1m
1m
unit
about 1.4m
MICROPHONE
ceiling
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
OCT
A
VE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
µ
bar)
PCA-RP6GA
NOTCH
High
Med1
Med2
Low
SPL(dB)
48
46
44
42
LINE
OC311--2.qxp 04.5.31 1:04 PM Page 49
