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Author
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Topic: Balancing Dolby SR and Dolby Digital levels
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Russ Kress
Expert Film Handler
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Posts: 202
From: Charleston, WV, USA
Registered: May 2000
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posted 08-28-2000 12:36 AM
I just dealt with this!!If you are using the latest software revision, just run some 69T and verify Dolby Level for your analog decoding. BUT!!! If you are using older software where fader levels are pre-set by format instead of the processor "remembering" the last fader setting (CP-500), make sure that both formats are set at the same level. I have one processor out of eleven that still has this software, and it gets me every time! (LOL) Speaking from experience, it is easy to neglect the analog optics since they have progressed to a back-up status for the SRD. Just because we are using LEDs instead of exciter lamps doesn't mean that they won't change with time (or fail for that matter). The print in question (The Cell) was just moved to this particular auditorium this week. The SRD failure is on a part of one reel of the print. The levels were matched in the previous auditorium so the drop out was not noticed until the move. Analog sound will never go away. Digital failure is too absolute. I prefer the seperation of digital, but the soundtrack is too fragile. Analog can fail in degrees, but digital (in any format) is either there, or it isn't. Give me digital sound!! But on a Saturday night, give me a good SR encoded analog back-up as well! After repairing the defective LED, we ran in digital and let the drop-out happen. No one noticed. I think that Spectral Recording could have been a mile stone in the recording industry had "digital" waited a few years before becoming such a magic word. Heck, just compare the dynamic range between the two mediums. Russ
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Brad Miller
Administrator
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Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99
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posted 08-28-2000 02:06 AM
Russ, he's got a CP55, not a CP500. Besides, if you have to change the fader on the default to SR, there is something off. Michael, I've seen bad Dolby tone test film that was severely "off", for lack of a better term. Get yourself another loop as a different opinion. Without a full A-chain, you can't be positive, but that should be checked for verification. I've never ran a DA20 through a CP55, but I have a feeling it may be a compatibility issue as no DTS unit I've ever installed on a CP55 was ever able to achieve high enough playback levels to match the analog on a CP55.
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