[ProAudio] FeralA - Recordings released encoded with Dolby A

[Richard L. Hess]

On 2020-02-11 3:51 p.m., Bob Shumaker via ProAudio wrote:
>
>     II. As for Bob O's comment against the practice of doing elevated
>     dolby level, I agree there was a standard for 185, but as people
>     started to use elevated levels as high as 6 dB over 185, I was
>     seriously concerned about running out of headroom in the Dolby
>     gear if standard dolby level was used, and so as a practice, I see
>     less harm in using an elevated dolby level than to overload the
>     Dolby processor with too hot audio. I always recorded dolby tone
>     as well as 1 kHz @  VU. The Dolby 361 meters, as Richard
>     mentioned, were notoriously inaccurate, I would put a sharpie mark
>     on the real dolby level on the meter, for what it was worth. There
>     was a Dolby tester that could be used for accuracy of the dolby
>     tone or I believe a test point that could be checked. 
>
> I agree with Bob K's concept for elevated record levels. How does the 
> Dolby unit know what the flux level is. The situation was even worse 
> for how SR was supposed to be setup. Not many consoles would have had 
> the head room needed and the meters would have been pinned much of the 
> time.
>
And then, of course, there is the issue with trying to reproduce dbx 
encoded tapes! if they have peaks on the tape 10 dB above lineup tone, 
then the output of the dbx decoder gives you a peak 20 dB above lineup 
tone. That certainly requires judicious adjustment of the system gain 
staging.

Richard

--
Richard L. Hess                   email: richard at richardhess.com
Aurora, Ontario, Canada           http://www.richardhess.com/
http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.

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