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If you're talking in-wall, don't neglect your local building codes.
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Make sure the wire is CL2 or CL3 rated. There is alot of debate over things like copper purity, number of strands, etc. But it isn't clear as to whether or not the sonic difference among purity and strand difference within a guage is discernable. What does make a difference is diameter (guage). Check out this website for a discussion of speaker wire
(roger-russell.com/wire/wire.htm#anhonest)
14ga is good enough for most applications unless your run is nearing 100'. Be sure to run quad shield coax for your SVS subs since they are PCs.