Noise Criterion Curves - Mitsubishi Electric PKA-A18HA6 Service Manual

5

NOISE CRITERION CURVES

PKA-A12HA6
PKA-A18HA6
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
OCH580
NOTCH SPL(dB) LINE
High 43
Low 36
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
500 1000 2000 4000 8000
UNIT
3.3ft
3.3ft
MICROPHONE
11
WALL