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From: "Phil Allison"
References: <3DEE2757.EE79B063@crf.canon.fr> <3DEFD744.3A2D8C8D@gv.net>
Subject: Re: audio line specifications
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sat, 7 Dec 2002 09:13:02 +1100
NNTP-Posting-Date: Sat, 07 Dec 2002 09:02:05 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Vlad" wrote in message
> On Fri, 6 Dec 2002 16:08:18 +1100, "Phil Allison"
> >"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
> >more then correct termination of the line is important. If wavelength
> >the issue then it would not matter until 10 or 15 km.
> >................. Phil
> And that is exactly why it is not important.
** 100 meters of unterminated twisted pair mic cable has enough
capacitance to cause significant effects on the driving amp - especially one
that usea a transformer. 1 km of such cable is IME impossible to drive
without attention to the termination conditions and drive amp capabilities.
> We use to have a "in house* rule that terminations are important when
> the line is longer than ten wavelengths of the highest frequency of
** What "house" was that in ?
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