AudioBanter.com - View Single Post

(Colin Bigam) wrote in message . com...
"Geoff Wood" -nospam wrote in message ...
"Colin Bigam" wrote in message
m...

I'm not really expecting any audible benefit, but I'd like to do
things 'ideally.'

You'll have ground loops with each additional cable through the siganl
ground conductor. Connect the sheild at both ends and you'll have an extra
one per cable.

So what is the problem with connecting the shield at both ends of the
cable then? Is it the possibility of inducing a current in the shield
that's not present in the ground, or...?

For that matter, what would happen (electrically) if the shield was
unattached at either end?

Sheilded cable, not coax. They are different things.

Yes, I realise this. That's why I said "either...or..." I know that there
are at least a few companies using coax for interconnects, but 90+% use
regular shielded cable.

No, you won't be mucking up impedences. They are pretty
irrelevant at those frequencies and lengths anyway.

Well much of my planning is based on a pair of articles by Jim
Heyward in Audio Ideas Guide. He pointed out that with a badly
designed preamp (specifically he talks about one where the output
feed is taken directly from the wiper of a 250kohm volume pot, so
the output impedance is not only outrageously high but varies
with volume) and a badly designed intercoonect, you can have a
3dB cutoff at below 3kHz!!! Using the same (bad) cable on low
output impedance preamp lead to a cutoff of about 1.5MHz.

Do you have a problem with 'reguar' interconnects, or just experimenting ?

Well it boils down to three salient points:

1) I need new interconnects.
2) I'd just as soon make them as buy them.
3) I'm a firm believer in engineering. Preferably massive overengineering

So if I'm going to make these things, I want to make 'em capable of staying
flat, clean, and noise-free across as wide of a bandwidth as possible with
the worst possible source and load; and then attach them to the best possible
source and load I can. :-)

Colin

4) you havent figured that the idea with money is to get something of
some function and value when you hand it over. Fools and their money
are soon parted.

Regards, NT