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Topic: 70mm 6-track Mag help
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Dave Cutler
Master Film Handler
Posts: 277
From: Centennial, CO
Registered: Jun 2000
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posted 07-27-2000 06:26 PM
Alright I work at a Large Format theatre and I have a Simplex 35/70 combo projector as well. I have a CP-500 for the 35mm sound but have NO 70mm sound system. I am trying to think up a way to get 70mm 6-track Mag for as little as possible, but still have good sound.I have 3 Dolby Cat 363's (6 channels) that we use for out 35mm mag dubber. These could also be used for 70mm Mag, correct? Can the Cat 363's be hooked up to the CP-500? What order should the chain be (ie Head, preamps, 363, processor or what)? Can the CP-500 just serve as a through put for a signal? BTW, Who makes good mag preamps? Dolby? Smart? etc... FYI, at this point I am not trying to downmix academy 70mm Mag. Just trying to get Split surround mag capabilities. Are more (older) prints in the Academy format or split surround format? We want to run older films but if we have to downmix Le and Re that would be harder. Should I just break down and try and afford a Panastereo CSP4600 70/35mm Magnetic Processor? Don't think they'll go for it though. As you can see I was half thinking this through as I was typing. Thanx for any help.
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 07-27-2000 09:59 PM
Ok...here is what you do....First the order of things... Heads -> Preamps -> NR (363 SR/A) -> CP-500 As far as preamps go, you have several options. You can obtain a used Dolby MPU-1, or you can just buy the Cat. 92C preamp cards and make your own card frame. Panastereo is about to offer a 1U MPU frame that has just the preamp section of the CSP-4600 that shouldn't break the bank yet provide excellet quiet, wide range preamps. Now as to the decoding....no problem there either with the CP-500. You will need to create a user format. Do so by copying format 43 so everything will come out of the right holes and the split surround decoding will be activated. Then, turn off the internal NR since the Cat. 363 will be handling those functions. The unit may squawk at you if you don't have all the NR slots filled and trying to copy the Format 43 settings, if so, you can always do each item manually. Steve ------------------
"Old projectionists never die, they just changeover!"
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Ari Nordström
Master Film Handler
Posts: 283
From: Göteborg, Sweden
Registered: Jan 2000
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posted 07-28-2000 03:28 AM
Re "older prints":This depends on how old the older prints are. The first Dolby 70mm prints came in the late 70's. Everything before that, and some prints in the beginning of the 80's, were "Academy" prints. If I remember correctly, the oldest 70mm Dolby print I've run is "Apocalypse Now". On the other hand, the 70mm print of "Grease", a film about as old as "Apocalypse", was an "Academy" print. Also, some films had 70mm prints made with different sound formats, depending on where they went, so the American prints of "Grease" could very well have been equipped with Dolby sound. I know the Swedish ones weren't. Split surround in Dolby mag sound is younger than that but I'm not sure when it was introduced. Anyone?
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