Dolby Laboratories CP65 - Manual (Page 53)

B-Chain Alignment Procedures
Action Indication Step
No.
5-28
.05 .1 .2 .4 .8 1.6 3.15 6.3 12.5 kHz
dB
–10
+5
0
–5
+10
CENTER
CHANNEL
NOTE THIS LEVEL
11
1 12
auto
subwoofer
off
CAT. NO. 441
13
d. Subwoofer Alignment (Cat. No. 441)
REPEAT
→
8 10
auto
subwoofer
off
CAT. NO. 441
04 Dolby Stereo A-type
B-Chain Alignment Procedures
Notes
5-29
d. Subwoofer Alignment (Cat. No. 441)
If using a single microphone, relocate the microphone to at least one other location in the
theatre and check the audio spectrum on the RTA. Repeat the freq, cut, and Q
adjustments to obtain a good average overall equalization at these locations of the
microphone.
Select format 04 Dolby Stereo A-Type.
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.
Place the subwoofer switch on the Cat. No. 441 in the OFF position.
Note the average level of the third-octave bands between 100 Hz and 1 kHz.
Place the C toggle switch in the OFF (center) position and place the Le toggle switch in
the ON (up or down) position.
Place the subwoofer switch on the Cat. No. 441 in the auto position.