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Author Topic: CP65 question Bob Healey Film Handler Posts: 93 From: Milford, CT Registered: Sep 2001 posted 11-05-2001 04:52 PM                     I have not tried that switch, so I do not know if there would be any pitfalls associated with it. It is one of the few things we have not rigged a series of switches for. We don't run mono enough to make it worth seriously investigating.  |  IP: Logged Greg Mueller Phenomenal Film Handler Posts: 1687 From: Port Gamble, WA Registered: Jun 99 posted 11-05-2001 05:12 PM                        Right, and that's kinda why I didn't want to do any slicing and diceing to the cards ------------------ Greg Mueller Amateur Astronomer, Machinist, Filmnut http://www.muellersatomics.com/  |  IP: Logged Bob Healey Film Handler Posts: 93 From: Milford, CT Registered: Sep 2001 posted 11-05-2001 06:05 PM                     If I were to attempt it, I'd use two switches mechanically rigged so that they both had to be in the same position. I'd cut the L C R lines between the output terminals on the CP65 and the input terminals on the power amps. One switch would be a double pole switch and be inserted into the L and R lines with L on one pole and R on the other. When the switch is closed, L and R can get from the CP65 to the amps, when its open, the L/R terminals on the processor are isolated. The second switch would be a double throw switch of some type. In one position, C on the Dolby would pass through the switch to the amp, in the other position, the feed from C on the dolby would be split three ways into each power amp, downstream from switch on the LR lines to prevent feeding C into L/R out on the dolby. Quick and dirty sketch done in paint brush:  |  IP: Logged Greg Mueller Phenomenal Film Handler Posts: 1687 From: Port Gamble, WA Registered: Jun 99 posted 11-06-2001 09:18 AM                        Good idea, I'll do it ------------------ Greg Mueller Amateur Astronomer, Machinist, Filmnut http://www.muellersatomics.com/  |  IP: Logged Bob Healey Film Handler Posts: 93 From: Milford, CT Registered: Sep 2001 posted 11-06-2001 12:34 PM                     Just remeber my previous post is all theory and has not been verified.  |  IP: Logged Ray Derrick Master Film Handler Posts: 310 From: Sydney, Australia Registered: Sep 2001 posted 11-07-2001 05:48 AM                     There is an easier way with just one DPDT switch. You could substitute a relay with DPDT contacts for the switch and drive the relay (via a suitable buffer) from the Mono indicator output from the CP65. This would ensure that the system was put back to normal whenever Mono is not selected. Also note that sending the mono signal to the left and right channels as well as centre will result in an increase of 4.77dB in SPL. So it will be necessary to pull the CP65 fader back about a notch and a half to compensate. Ray Derrick President Panalogic Corporation Pty Limited 44 Carrington Road Castle Hill NSW 2154 Australia Phone: 61 (0)2 9894 6655 Fax: 61 (0)2 9894 6935  |  IP: Logged Greg Mueller Phenomenal Film Handler Posts: 1687 From: Port Gamble, WA Registered: Jun 99 posted 11-07-2001 09:01 AM                        Excellent! Having to roll off the gain 1-1/2 would be just about right as I have to run everything else at 5-1/2 or it's too loud anyway. This is gettin better all the time. Thanks ------------------ Greg Mueller Amateur Astronomer, Machinist, Filmnut http://www.muellersatomics.com/  |  IP: Logged

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