Can somebody explain to me how the composition and/or size of a speaker wire can possibly have an effect on the sound the speaker produces

I don't really get it either. I've only used crappy wire vs. Monster cable and can't tell the difference. I saw this guy's site and I'm gonna try to make some of my own (I have a bunch of RG-6 doing nothing).
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-Rob Riccardelli
80GB 16MB MK2 090000736