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6
NOISE CRITERION CURVES
PKA-RP35/50GAL
PKA-RP35/50GAL#1
PKH-P35/50GALH
90
80
70
60
50
40
30
20
10
OC330C
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63
125
250
500
BAND CENTER FREQUENCIES, Hz
UNIT
1m
1m
MICROPHONE
11 11
NOTCH
SPL(dB)
LINE
High
43
Medium1
41
38
Medium2
Low
36
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
1000
2000
4000
8000
WALL
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