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Author Topic: Format 11 Vs Format 22 on CP650 Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 07-31-2017 09:14 PM                     Using Format 11 (6 channel input) I'm able to play the four channels from my 35mmm mag reader. I set up U1 for Format 22 which displays "4 Channel Mag Stereo) The problem is the surround track will not play. What am I missing?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-01-2017 07:10 AM                     A 12KHz pilot tone to turn the surround channel on? Is the print you are playing absent from having the pilot tone?  |  IP: Logged Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 08-01-2017 07:51 AM                     Steve I'm using a Smart 435 preamp which doesn't have the 12hz tone capability like the older 430 preamp. Using Format 11 the surround channel is constantly present.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-01-2017 09:45 AM                     The tone is on the film. If the preamp is passing the tone to the CP650, then it would be up to the CP650 to turn the surrounds on/off based on that tone. That said, I have never configured the CP650 for format 22 so I don't know if that is the issue or not but when I hear no surrounds, then I think the pilot tone is not being triggered to turn them on.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-01-2017 01:57 PM                     You ought to get your self a real Dolbly MPU and get rid of the Smart thingy. The Smarts never had any bottom end response to them. If you hunt around you might even find a 12khz switching card for the Dolbly MPU. Mark  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 08-01-2017 04:43 PM                       The 12Khz card is rather rare for the MPU. Mostly they were sold for 70mm and even though there is a card bay for 35mm Cat. No. 92's is was usually not purchased with that card. Often they there were fitted with a 12 Khz bypass card. I look forward to hearing the answer to why the surround channel is not getting through as well.  |  IP: Logged Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 08-04-2017 04:49 PM                     Back on this project after 3 days out of town. Steve....I was not aware that the CP650 had the ability to detect the 12Khz tone and turn it on/off. Mark....I had the complete Dolby MPU with the card and sold it a couple of years ago. Sam....I hope to get to the bottom of this issue soon.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-04-2017 04:54 PM                     Don, I don't know for sure that the CP650 does decode the 12KHz tone, it was just a gut reaction to the symptoms you described. I'd have to research it to get a definitive answer.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-04-2017 05:33 PM                     You should buy that Dolby MPU back!The Smart is a POJ.... Mark  |  IP: Logged Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 08-04-2017 11:37 PM                     So here's a quote from the operator's manual for the CP650: Format 22 35mm Composite Magnetic 4-Track Standard 4-track, no NR, magnetic filter Is it possible that the term "magnetic filter" suggest there is a 12Khz filter build in the processor?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-05-2017 04:45 AM                     No. The magnetic filter means that it applies a reduced form of the Academy filter to knock down some of the highs/lows to "Conventional" magnetic prints without Dolby NR.  |  IP: Logged

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