I believe Dobly ref is 400Hz, but for speed adjustment 5k is a lot
easier to read on a frequency meter, according to my experience running
a realtime duplication line with 50 Sonys double decks. Higher freq
resolves faster...
Lou Judson • Intuitive Audio
415-883-2689
On Aug 28, 2006, at 8:00 AM, Mike Richter wrote:
> I should think anyone dealing professionally with cassettes would have
> a Dolby reference tape. Though I'm a rank amateur, I have a pair of
> them and have used them often in setting up decks to transfer tapes.
> IIRC, the tone is 1 KHz, but regardless of the frequency it is
> recorded at reference level and the two (from different sources)
> continue to check out against one another after decades of occasional
> use.
>
> Mike
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