Premium cables are effective (to a point) on analog
systems,
There are certainly some awful cables about, but in my experinece ]1] any
good quality screedn cable is OK. The 'audiophool' cables do not make any
diference.
]1] Ues, biased sample, personal opinion, etc.
I have worked with measuring instruments which look at much smaller signals
and have a much higehr resolution than any audio system. Not one of them
uyses any 'audiophool' cable. Just normal cable and good desiggn practices.
though I think Monster very much oversells it and
charges a lot
more than you can get equivalently good cables for. They also
have complete nonsense like "premium power cables", which are
bogus because if you have noisy power, nicer power cables are
just going to transmit the noise more accurately (though I'm
not convinced they make a difference at all).
Firsly, what do you do about the miles of cable from the substation to
your house, the electricity meter, fusebox, house wiring, etc ;-)
Secondly, if the power cable makes a differneec to the sound or picture
[2], then I would sguggest designign the pwoer supply proeprly (or
fixing the faults in it) would be much more sensible than buying a special
mains cable.
[2] Other than the obvious thing that if you have no power cable you get
no sound or picture :-)
-tony