11
5
NOISE CRITERION CURVES
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0dB=0.0002
µ
bar)
BAND CENTER FREQUENCIES, Hz
PKA-RP35GAL
PKA-RP50GAL
PKH-P35GALH
PKH-P50GALH
High
NOTCH
Medium1
Medium2
Low
43
SPL(dB)
41
38
36
LINE
UNIT
WALL
1m
1m
MICROPHONE
OC330--1.qxp 05.5.9 1:30 PM Page 11
