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Author
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Topic: Need Suggestion regarding Stereo System using CP45
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Tony Bandiera Jr
Film God
![](/ubbmembers/2365e.jpg)
Posts: 3067
From: Moreland Idaho
Registered: Apr 2004
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posted 04-09-2009 01:52 PM
Guys, while the replys so far are very true in what you all are saying, it seems as though you didn't read the opening post carefully and understand the setup:
Outputs of Left, Center and Right of CP-45 to go to a mixer; Mixer will output Left and right to speakers behind the screen; The outputs of the CP-45 will be assigned as follows, using the mixer:
Left to Left; Right to Right; CENTER will Be sent equally to Left AND Right.
Will there be delay/lip synch issues? NO. Phase issues? NO, unless he connects one of the speakers backwards Dialog intelligibility issues? Slight. This is not an optimum set up but it WILL work well, I have done it several times on temp shows with no ill effects.
Some important things to do though:
Both speakers MUST be placed EXACTLY with their faces on the same plane (or line if you prefer) as if one is even slightly forward or back from the other things can get a bit weird;
Bot speakers MUST be the exact same make and model, and the gain (level) from each speaker MUST be the same within 1dB or less;
If the auditorium is wide it would help a bit to toe each speaker in toward the center slightly while maintaining alignment in the same plane;
Most importantly; set the CENTER channel output of the CP-45 to 3-4dB HIGHER than Left and Right, and make sure that gain follows thru the mix to the output.
As pointed out, this is NOT an optimal setup but in can and will work well until the theatre can upgrade and get the dedicated center channel speaker and amp.
Martin, taking the Lt and Rt signals WILL have the phase and decoding (or lack of) issues that you speak of...if the OUTPUTS of L,C,R are taken from a PROPERLY aligned (A and B chain wise) processor there better NOT be any phase or delay issues or the processor has issues!
Remember, like Ken pointed out and you all should know by now, even in optical the decoder matrix in the processor strips virtually all of the center channel information from the Left and Right outputs, that's why you would not be able to hear the dialog if you just ran Left and Right outputs from a processor.
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