Noise Criterion Curves - Mitsubishi Electric Mr.SLIM PKA-A12HA4 Service Manual

5

NOISE CRITERION CURVES

PKA-A12HA4
PKA-A18HA4
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
SPL(dB) LINE
NOTCH
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
WALL
8