Dolby Laboratories CP500-300 Installation Manual Page 54

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Page view 53
B-Chain Alignment Procedures
Action
Indication
Step
No.
5-26
8
9
10
d. Subwoofer Alignment (Cat. No. 441)
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
SubwooferLeft Surround
Right Surround
Cat. No.
441
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
SubwooferLeft Surround
Right Surround
Cat. No.
441
D
olby
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
SubwooferLeft Surround
Right Surround
Cat. No.
441
D
o
lb
y
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
SubwooferLeft Surround
Right Surround
Cat. No.
441
.05
.1
.2
.4
.8
1.6
3.15
6.3 12.5 kHz
dB
–10
+5
0
–5
+10
D I P
.05
.1
.2
.4
.8
1.6
3.15
6.3 12.5 kHz
dB
–10
+5
0
–5
+10
S K I R T S
.05
.1
.2
.4
.8
1.6
3.15
6.3 12.5 kHz
dB
–10
+5
0
–5
+10
B-Chain Alignment Procedures
Notes
5-27
d. Subwoofer Alignment (Cat. No. 441)
Turn the freq control on the Cat. No. 441 card. A dip in the frequency response will move
along the frequency axis of the RTA display.
Adjust the cut control so the center of the dip flattens. The center of the dip should be at
the same level as the skirts.
Adjust the Q control for the flattest possible frequency response.
Adjust the freq control so the center of the dip is in the same band as the highest peak
in the unequalized subwoofer frequency response you were asked to take note of in
Step 5.
5
FROM :
.05
.1
.2
.4
.8
1.6
3.15
6.3 12.5 kHz
dB
–10
+5
0
–5
+10
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