Everyone's talking about wire resistance - the thing the phools are after is characteristic impedance, which is determined by conductor diameter, spacing, and dielectric constant. It's quite irrelevant at frequencies where the length of the transmission line is less than, say, 1/100 of a wavelength at the frequency in question.
Why is there all this discussion about cable resistance and crap? If you pay more than a few cents a foot for your speaker cables, you're an idiot.
It's just that simple.
Cheers! Rich