And Lindsay had the same phantom noise using his FR2 with ME62, which
is fully symmetrical.
I know that you are right, Raimund, - in theory - but I left "theory"
a few years ago. Not much makes sense to me nowadays.
When solving mysteries anyway, I can tell that my Sonic Stage works
perfectly when I disable Norton. A friend tipped me about it. Had the
same experience.
As far as I understand it, Norton and Sonic Stage "should" (in
theory) have no connection whatsoever. Or?
Klas.
At 09:23 2007-03-22, you wrote:
>Klas, you wrote:
> > Hmmm.. there are very few "fully balanced" microphones today. Most of
> > them, even the MKH series for example, (and R=F6de NT1A) have pin 3
> > just AC grounded. So oscillation occurring internally in the mic,
> > will go straight into pin 2 and never get outbalanced.
>
>Are you sure? As far as I know, all common phantom-powered microphones
>provide a balanced output. I just googled for microphone circuits and
>found this very interesting page that exlains the principle of the MKH
>microphone series:
>
>http://www.beis.de/Elektronik/HF-Mic/HF-Mic.html
>
>I admit that it is quite difficult to fully understand that circuit.
>Though, it is clear that pin 3 is not AC grounded!
>
> > The only way I know that mic electronics can make an unclean phantom
> > power even worse, is when something in the circuit starts to
> > self-oscillate. But such an oscillation is easy to see on the scope.
> > And the PRO6 handle is actually only a simple filter and source
> > follower!? Quite conventional and fully established.
>
> > And why shouldn't PRO6 work with a semi-pro machine like the Fostex,
> > when it works fine with a cheap consumer machine like the Zoom H4??
>
>Is pin 3 of the PRO6 really AC grounded? If so, this unusual
>asymmetric design could be the reason for the problems with some
>recorders. As I mentioned before, a microphone that provides
>complementary AC output signals on both pin 2 (+) AND pin 3 (-),
>should be less demanding regarding any potential phantom power noise.
>If you use an asymmetric design, there should be no AC grounding on pin 3!
>
>Regards,
>Raimund
>
>http://www.avisoft.com
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
website: www.telinga.com
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