Mitsubishi PKH-1.6GKLH Technical & Service Manual page 13

6. NOISE CRITERION CURVES
PKH-1.6/2GKL
PKH-1.6/2GKLH
1m
MICROPHONE
OC229A
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
UNIT
WALL
1m
SPL(dB)
NOTCH
Hi 43
Lo 36
500 1000 2000 4000
Ambient temperature 27
Test conditions are based on JIS Z8731
1 1
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
8000