Electra WNG 50 DCI Service Manual page 31

SOUND LEVEL CHARACTERISTICS
Sound Pressure Level Spectrum (Measured as Figure 5)
DCI 80 Cooling
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
BAND CENTER FREQUENCIES, Hz
6-4
NC-70
NC-60
NC-50
NC-40
NC-30
APPROXIMATE
THRESHOLD OF
HEARING FOR
NC-20
CONTINUOUS
NOISE
Revision Y05-02
Service Manual - WNG 50_60_80 DCI
CONTENT
DCI 80 Heating
BAND CENTER FREQUENCIES, Hz
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20