Dolby Laboratories CP65 - Manual (Page 54)

B-Chain Alignment Procedures
Action Indication Step
No.
5-30
.05 .1 .2 .4 .8 1.6 3.15 6.3 12.5 kHz
dB
–10
+5
0
–5
+10
.05 .1 .2 .4 .8 1.6 3.15 6.3 12.5 kHz
dB
–10
+5
0
–5
+10
14
d. Subwoofer Alignment (Cat. No. 441)
15
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
10 Dolby Stereo
Digital
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 16
.05 .1 .2 .4 .8 1.6 3.15 6.3 12.5 kHz
dB
–10
+5
0
–5
+10
+10 dB
.05 .1 .2 .4 .8 1.6 3.15 6.3 12.5 kHz
dB
–10
+5
0
–5
+10
.05 .1 .2 .4 .8 1.6 3.15 6.3 12.5 kHz
dB
–10
+5
0
–5
+10
auto
subwoofer
off
auto
subwoofer
off
1 12 SAME AS
B-Chain Alignment Procedures
Notes
5-31
d. Subwoofer Alignment (Cat. No. 441)
Adjust the optical gain control on the Cat. No. 441 card so that the average level of the
bands from the subwoofer is at the same level on the analyzer screen as you noted for
the center channel in the previous step.
Place the Le toggle switch on the Cat. No. 85C card in the OFF (center) position and
place the C (center channel) toggle switch in the ON position.
Note the change in the average level of the bands from 20 Hz to 100 Hz when the
subwoofer switch on the Cat. No. 441 is switched between OFF and AUTO. There
should be a level INCREASE when it is switched to AUTO. The subwoofer is out of
phase with the front channels if you do not see this level increase. Reverse the
subwoofer(s) speaker connections.
Re-select Format 10.
Adjust the mag/dig gain on the Cat. No. 441 so that the level of the bands from the
subwoofer increases 10 dB above the level in the previous step.
The subwoofer alignment is completed.