Before you guys get all excited about Sound King cabling, which is basically just "low cost" heavy gauge zip cord, you should be aware that it typically turns green from internal corrosion with age and becomes resistive. It is also relatively high in inductance and will cause a softening of treble response. This becomes more apparent as you use longer lengths since its' electrical characteristics are compounded. If you have a bright or sibilant sounding system, this might be just the cure.
If looking for a cable that offers more bang for the buck, you might want to check out part number 100-768 from Parts Express. It is actually slightly cheaper than the equivalent length of 12 gauge Sound King, is more linear over a wider frequency range and works out to be 11 gauge, which is a heavier gauge and offers lower series resistance.
As a side note, the picture shown on the website is NOT of the actual cable that you'll get. It is similar to that, but uses a tan / creme coloured jacket. Sean
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PS... Apature is another manufacturer of low cost "zip cord" and can be found inside of some expensive speakers. This cabling also turns green over time and should be avoided.