Cat. No. 441 Alignment Instructions from the CP65 Manual
Notes
2-31
Cat. No. 441—Surround Equalization Alignment
The surround equalizer on the Cat. No. 441 card consists of:
•
A parametric mid-band section with variable cut, bandwidth, and center frequency.
•
Shelving type Bass and Treble controls.
All connections established in the previous procedure still apply to the surround equalization
alignment. Confirm that the microphone is in the position defined earlier. Ensure that
format 04 is selected.
Note: The Cat. No. 441 can be configured for either Mono or Stereo surround operation using link
J3. If Mono operation is selected then an identical signal will be fed to both Ls and Rs outputs
in all formats. If only one power amplifier is to be used for the surround channel then the Ls should
be used. If more than one surround amplifier is to be used, both outputs may be used to feed, for
example, balcony and ground floor. The separate level controls and equalizers may then be used
to compensate for differences caused by the different acoustic environments of the two areas. If
stereo operation is selected a stereo surround signal will be fed to the surround channels when
format 10, Dolby Digital is selected.
If the surround speakers are wired for stereo operation or both surround outputs are in use
switch off (or disconnect the input to) the right surround amplifier or amplifiers.
Turn on the S switch on the Cat. No. 85C pink noise generator. Be sure that format 04
is selected.
Adjust the Ls ( left surround) gain control on the Cat. No. 242 B-Chain card for a sound
pressure level of approximately 85 dBC in the theatre. If only one surround output is used
set the level to 88 dBC.
