Dolby
®
Model CP650 Installation Manual
B-Chain Alignment
4-28
Rotating Noise
Press OK to
Start or Stop
Running L
CAUTION
Pressing OK will play
pink noise in the
auditorium
4.8
Final Sound Check: Rotating Pink Noise
1 2 3
7
4 5 6
8
Slide DIP switch 6
down
to the normal position.
The CP650 will switch to normal operation with
the user’s menu choices available.
menu
OK
Press the left menu button multiple times to move
the display to the Rotating Pink Noise screen.
OK
Press the right OK button to start the pink noise.
OK
Pink noise is sent to each channel in turn, holding
for five seconds at each channel. The channel
currently running pink noise is shown on the
bottom right-hand side of the display.
Unlike the different levels used during alignment,
the rotating pink noise is set to 85 dB for all
channels during this test.
Pressing the right OK button stops the pink noise
from moving to the next channel. Pressing the OK
button again resumes pink-noise rotation.
Go to the auditorium and sit two-thirds of the
distance from the front speakers to the rear, and at
the center from side-to-side. All channels should
sound equally loud and have similar frequency
response as the noise rotates. An SPL meter can
be used to confirm accurate and equal level
settings.
Press the illuminated
format
button to return the
CP650 to normal operation.
