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33
1.5m
(5ft)
1m(3.3ft)
MICROPHONE
UNIT
GROUND
4-3. NOISE CRITERION CURVES
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
MXZ-8B48NA
COOLING
MODE
HEATING
54
SPL(dB)
55
LINE