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This topic comprises 2 pages: 1 2
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Topic: 70mm formats 40,41,42,43 with CP-500
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 01-23-2015 05:52 PM
Scott,
NO!!!
What the CP200 applies in format 40 (or 20) is a modified form of the Academy curve (much less aggressive). This IS what you want...you do NOT want it flat. I had this discussion with another person (of rather high caliber). The theory was that there wasn't any real definition for any per-emphasis on the mag formats.
What was not taken into consideration is that the theatres and equipment of the day in those theatres (including dub-stages) were not exactly flat. You are going to get attenuation through the screen and without any EQ or other B-Chain beyond the response of the speaker, you are going to have a rolled off response on both ends.
When the films were mixed, they would have HEARD that response and adjusted accordingly.
However, when you are using a CP200 (or any post-Dolby processor) you will have EQed the room to the "X" curve and provided a MUCH wider/flatter response. The pre-Dolby films were NOT MIXED for that and WILL sound excessively bright.
The partial filter will take the edge off a little (and not quite enough, in my opinion).
When we did the Colonial Williamsburg Visitor Center (about 10-years ago)...we had the unique opportunity to have identical back-to-back theatres running a soundtrack mixed in 1957 and played back on both a 1960s era sound system using 1957 speakers in a room that hasn't changed since it was put in 50 years prior. We also had a "Modern" set up using Panastereo CSP4600/CSP1200 system and one could listen back-to-back the exact same soundtrack. Furthermore, one could run pink noise (I used Teccon's reference film) and MEASURE in the theatre the response of the film with both the 1960s sound equipment and the modern equipment.
If you wanted to match what that film was mixed for (and remember that film only has to play in ONE THEATRE...EVER), you would apply a MORE aggressive roll off than what the CP200 will...in fact, it is darn near the Academy roll off used for Optical Mono.
In fact, we were able to "tune" the rolloff on the Panastereo's Mag Preamps (after some Ray Derrick Mods) to the point that from a response standpoint, the two rooms were pretty close to identical in characteristics. However, once all done, the clarity of the Pana side was night and day better. It was quieter and cleaner. But when it was originally played back "flat," it was nasty and shrill.
So go ahead, remove that diode you put on "Filter". If you look at the CAT109 schematic, you'll see the filter characteristic is different for Mag (pin 16) than for optical (half).
What other "tricks" are you interested in? I think I've done just about everything that can be done with/to a CP200 and maintain a few "tricked out" ones. It is my favorite processor of all time (still).
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