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Posted by Marty on 09/30/05 23:27
Somewhere around Fri, 30 Sep 2005 02:35:03 GMT, while reading
alt.video.dvd.tech, I think I thought I saw this post from bv@wjv.com (Bill
Vermillion):
.. . .
>
>>And, in my opinion, cassette tapes. Back in another lifetime,
>>I worked for Dolby Labs (Licensing), and did a lot of testing
>>of tapes and decks. I found TDK AD tapes to be very good, low
>>distortion, low dropouts. Before that, I used to think Maxell was
>>the best, but I changed my mind.
>
>And we used the use the Super Avalyn [SA] tapes for dubs of masters
>for clients to listen to before continuing on.
>
>For standard cassettes we had a duplication house next to us load
>cassettes with Agfa - which was also very good for standard run
>tapes.
>
>The only weirdness we found was with the sound of the Nakamichi
>that were used at times. And then we found the original Naks
>used the original spec for EQ curves, while everyone else used a
>modified curve as it was cheaper and easier to do.
>
>Then we found out there was a Nak with a 'B' curve - that matched
>the industry standard but not the sepcifications.
>
When I worked for Dolby Licensing, I evaluated equipment that used Dolby's
trademark to make sure it met the standards. We provided a very detailed
report with lots of charts and graphs. If they didn't meet the standards,
they had to fix it. So, if the Nakamichi had Dolby noise reduction, it had
to use the same EQ as everyone else, and vice versa. For playback, there
were absolute standards. But for recording, it depends on the tape, and the
best results are only obtained by using the same tape they used to set it
up. So, if they used Maxell tape, then TDK may not sound right.
Different tapes had very different characteristics, and the best recorders
eventually had automatic setups for the tape, where it would automatically
adjust the bias, level, and EQ for that tape before recording (I had one of
these, and it really makes a difference).
--
Marty - public.forums (at) gmail (dot) com
"Those are my principles, and if you don't like them...
well, I have others." - Groucho Marx
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