Lexicon CP-1 PLUS V2.0 Owner's Manual page 22

Speaker
Set-Up and
Configuration
CP-1 Digital Audio Environment Processor
If your center channel speaker is smaller than the left and right fronts,
increasing BASS SPLIT will remove low bass from the center and increase
it in the left and right speakers. The center channel is so important in film
sound reproduction that we recommend it be the first addition to a stereo
system.
If the system will have a direct view (as opposed to projection) television,
a shielded speaker must be used to prevent interference with the picture.
Only one speaker should be used, as using two speakers to reproduce a
mono signal may cause loss of intelligiblity through inter-speaker interfer-
ence (comb filtering).
The center speaker should be placed as close to the TV as possible, and as
close to the horizontal axis of the main speaker's tweeters as possible. Side
speakers should be at the sides, or a little forward, of the listening position.
If the system is for music only (no film), the sides can be as far as 20 degrees
behind the listener. For film use, they should be slightly ahead of the
listener. Place the sides at, or slightly above, ear level. Ceiling placement is
not recommended, as this will reduce the stereo separation and will be quite
strange for film, where Pro Logic sends the same information to the sides
and fronts. The rears should be separated as much as possible and kept
away from the listener. Here, ceiling mounts are acceptable, as is mounting
hig (or in) the rear or back side walls.
Since the rear (surround) channel in the Pro Logic mode is monaural, a
single stereo map can be used to power both the center and rear speaker.
Consult your dealer.
The best set-up for those who like both music and films is Configuration 10.
The addition of side speakers allows all forms of source material to be
played without compromise.
The button on the back of the CP-1 labeled CENTER OUT/PHANTOM
IN is very important in the operation of the Surround modes. Make sure
the button is out if you have a center speaker and in if you have none. With
the button in (Phantom Mode) the center channel is mixed in with the two
main outputs; the side outputs carry the Left and Right signals; the center
channel is turned off.
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