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Subject: Re: audio line specifications
References: <3DEE2757.EE79B063@crf.canon.fr> <3DEFD744.3A2D8C8D@gv.net>
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Date: Fri, 06 Dec 2002 18:55:25 -0500
NNTP-Posting-Date: Fri, 06 Dec 2002 18:55:26 EST
Organization: Bell Sympatico
On Sat, 7 Dec 2002 09:13:02 +1100, "Phil Allison"
>"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 ?
> .................. Phil
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