Engineering Manual

A-225
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
SPL(dB(A))
LINE
56
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 ยตbar)
MUZ-D36NA
MUY-D36NA
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
57
COOLING
NOTCH
HEATING
UNIT
39-3/8 inch (1m)
MICROPHONE