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From: Watson 'Atto Parsec' Name
Subject: Re: audio line specifications
References: <3DEE2757.EE79B063@crf.canon.fr> <3DEFD744.3A2D8C8D@gv.net>
X-Newsreader: MicroPlanet Gravity v2.60
Date: Fri, 6 Dec 2002 05:28:57 -0800
NNTP-Posting-Date: Fri, 06 Dec 2002 06:31:02 PST
Organization: InReach Internet
In article ,
> "Michael R. Kesti" wrote in message
> > Vlad wrote:
> > >Yes. The impedance of the line is NOT important.
> > The impedance of the line is not usually important, because audio lines
> > are usually shorter than the shortest wavelength in the audio band.
> ** Not again!! This is non relevant. If you need a ( twisted pair)
> balanced audio line to have a flat response over distances of 100 metres or
> more then correct termination of the line is important. If wavelength was
> the issue then it would not matter until 10 or 15 km.
I have read many of the followups, and I don't think anyone has
mentioned the subject of the cable capacitance and why it is necessary
to have a low enough impedance to prevent the cable capacitance from
rolling off the high end of the signal. In other words, the line driver
has to have a low enough impedance to drive the line adequately at the
highest frequencies, no matter what the length of the line is. It could
be only 3 meters long, but if the driver is a crystal microphone, which
has a high impedance, then the high end may be rolled off by the few
hundred pFs of cable capacitance.
> ................. Phil
My email address is whitelisted. *All* email sent to it
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