Biwiring and Cables, A couple of questions on how to Options

[atici]

I want to buy decent cables for my speakers and was wondering on how the setup should be.

The speakers in question (Infinity Alpha 40) is biwirable. My amp has two pairs of speaker outputs. In this case which one is a better idea: to use biwiring cables or use separate wires using both of the speaker outputs on my amp? If I use separate identical cables, does the length make difference?

And about the cable diameter, are the thick ones necessarily better? If so how much? I am planning to spend around $80 for my cabling. 7 feet cable for each channel is sufficient. Do you have any suggestions on quality but cheap cables? What do you think about the ones here?

Please let me know what you think. Your help is much appreciated.

[KikeG]

Oh man... biwiring is *useless*, has no sense from an electrical/technical point of view. The only thing you do biwiring is double the capacitance and half the resistance. Capacitance is negligible in case of speaker cable. And resistance, well, once you are using a thick enough cable, there's no point in halving it.

About high and low frequencies going through same cable, this is fine, cables are perfect linear devices from an audio point of view, so can carry all frequencies without interfering each other at all.

If anyone can give me an alternative technical explanation of why could it be better, I'll be pleased to read it.