Yes I have a sub woofer here with internal amp which used to pick up Radio
China till a friend put in some capacitors to stop it. It was coming in via
the input terminals. Bah humbug.
There is of course a person who makes loads of money out of unproven audio
cables called Russ Andrews who seems to make unsubstantiated claims for
anything he sells at huge mark ups.
To me this is a simple LF transmission line issue. So the losses matter
since the amp low impedance needs to be seen by the speaker to make them
have the right damping. Apart from that, all this talk of oxygen free and
the like is fiddling about at the edges of things.

Brian

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"Bert Coules" wrote in message
o.uk...
Brian,

Thanks for that. The existing cabling is hefty (and expensive-looking)
specialist speaker wiring: matching it exactly for new runs is going to be
pretty pricey, not that that's necessarily a problem, but it's also pretty
inflexible. I might suggest experimenting with something of similar
weight but easier to work with: if it functions OK for the longest
necessary run then it should be fine for the rest, if my friend is willing
to ignore the extreme high-end audiophile insistence on having all speaker
cables the same length.

The possibility of picking up radiated interference hadn't occurred to me
at all: that would liven up his listening no end.