Dolby Laboratories CP65 User Manual
Page 58
Action
Indication
Step
No.
5-38
B-Chain Alignment Procedures
85 dBC
STEREO SURROUND
88 dBC
MONO SURROUND
e. Surround Equalization Alignment (Cat. No. 441)
10
1
13
REPEAT
3
→
10
1
12
85 dBC
Dolby
n-sync
surr
gain
Q
on
present
signal
gnd
gain
bass
Q
mid
freq
cut
treble
tp
bass
Q
freq
mid
cut
treble
gain
mag/dig
opt gain
off
auto freq
cut
tp
present
signal
Subwoofer
Left Surround
Right Surround
Cat. No.
441
ON
RIGHT SURROUND AMP
OFF
LEFT SURROUND AMP
11
Dolby
gain
mono
non-sync
gain
points
test
mono eq
Ls
R
C
L
Ls
R
C
L
gnd
Ls
R
C
L
R
L
signal
present
Cat. No.
242
OFF
80
7
0
60
5
0
4
0
3
0
OFF
80
7
0
6
0
5
0
4
0
3
0
B-Chain Alignment Procedures
Notes
5-39
e. Surround Equalization Alignment (Cat. No. 441)
Adjust the Ls (Left surround) gain control on the Cat. No. 242 B-Chain card for a sound
pressure level of 85 dBC (or 88 dBC if only one surround output is to be used).
Repeat Steps 3 through 10 using the Right Surround pots on the Cat. No. 441 card.
NOTE: When you reach Step 10 remember that the right surround gain control is located
on the Cat. No. 441 board.
With the microphone still located at the center of the theatre, adjust the Right Surround
gain control on the Cat. No. 441 surround and subwoofer card for a sound pressure level
of 85 dBC.
If the surround speakers are wired for stereo operation or both surround outputs are in
use, switch on ( or reconnect the input to) the right surround amplifier or amplifiers.
Switch off (or disconnect the input to) the Left surround amplifier or amplifiers.