Dolby Laboratories CP65 - Manual (Page 52)

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
Subwoofer
Left 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
Subwoofer
Left 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
Subwoofer
Left 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
Subwoofer
Left 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