Film-Tech Forum ARCHIVE: 70mm 6-Track Dolby Mag Audio Specs

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Topic: 70mm 6-Track Dolby Mag Audio Specs

David Stambaugh
Film God

Posts: 4021
From: Eugene, Oregon
Registered: Jan 2002

posted 08-23-2002 05:52 PM

Can't seem to find this information anywhere.

What are the audio specs for standard 5-perf 70mm Dolby 6-track mag-striped prints? Frequency response, dynamic range, distortion, that kind of stuff. Would like info for both Dolby A and Dolby SR if possible.

Also, what is the effective linear speed of 5-perf 70mm in inches per second?

Thanks for any info.

-dave

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

posted 08-23-2002 06:42 PM

70mm 5-perf...22.4ips. Frequency response is as good as your heads (record and playback).

For references, check with the SMPTE. There are RP-128, EG-13 and ANSI/SMPTE 185 that all deal with 70mm audio.

Steve

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"Old projectionists never die, they just changeover!"

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