6-1
SOUND LEVEL CHARACTERISTICS
Revision Y05-01
Service Manual - ALPHA
6.
SOUND LEVEL CHARACTERISTICS
6.1
Sound Pressure Level
Figure 1. Wall Mounted
Figure 2. Floor Mounted
Figure 3. Ducted
Figure 4. Cassette
6.2
Soud Pressure Level Spectrum
(Measured as Figure 1)
Alpha 7
Alpha 9
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
OCT
A
VE
BAND
SOUND
PRESSURE
LEVEL,
dB
re
0.002
MICRO
BAR
FAN SPEED
LINE
HI
LO
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
OCT
A
VE
BAND
SOUND
PRESSURE
LEVEL,
dB
re
0.002
MICRO
BAR
