Noise Criterion Curves - Mitsubishi Electric MR. SLIM PKA Series Service Manual

5

NOISE CRITERION CURVES

PKA-A12HA7
PKA-A18HA7
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
OCH637
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
MAIN UNIT
3.3 ft
3.3 ft
MICROPHONE
WALL