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Author Topic: CP750 7.1 Peter W Schoell Film Handler Posts: 1 From: Paynesville, MN, USA Registered: Nov 2016 posted 12-27-2016 03:32 PM                     I have a couple of CP750s set up for 5.1 and I think I would like to convert them to 7.1. First, will I notice enough difference to make this worthwhile? I'm using ds200 processors, and the cable connecting them is a big multi conductor with DB25 ends. Can I change the pinout on each end to make 7.1 work? Then where do I get this pinout list? I would also need the pinout for the analog out to the amps. Will this be just a matter of adding 2 conductors for each new channel?  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 12-27-2016 07:40 PM                     You notice the difference in a movie with a lot of surround effects that use it. Odyssey makes a card that does the CP750 DB25 input swap of HI/VI and BLS/BRS for you. Worth the price. If you have a soldered DB25 output connector to the amps then you would need to add in two shielded pair cables for the two amp channels. Odyssey also makes a CP750 output card with tiny terminal blocks to connect the amp wires to, and it has a parallel DB25 connector as well. You could connect your new rear surround amp signal wires to the terminal block and continue to use the DB25 as-is for the 5.1 channels. Again it's worth the cost - unless you enjoy soldering DB25 connectors.  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 12-27-2016 09:19 PM                     Your CP-750 should have come with a manual on a disk. Or, if you have access to the Dolby Customer Portal, you can download a manual from there. It has a whole chapter (chapter 5) on converting a CP-750 to 5.1, and a complete diagram of the wiring changes you'll need to connect it to a DSS 200. But before you start pulling wires & making changes, the manual states that at a minimum your server software must be v4.2.1 or higher,and your CP-750 must be v1.2.6.5 or higher. I've also discovered (the hard way) that there are errors in the pin out diagrams of some of the earlier CP-750 manuals. I can't recall exactly what they were, but it took me awhile to figure it out. Manuals with a version number of "5" or higher seem to be OK.  |  IP: Logged

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