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The problem is a long run of speaker wire will roll-off the higher frequencies, but not the lower ones. This creates a "slant" in the sound compared to what a short-run of wire would produce. Thicker wire reduces, but does not eliminate the problems.
The only people who claim to hear this are people with:
- using L/R front speakers, not rears
- very detailed panel speakers
- pushing 200-300 watts per channel
- using CD/SACD sources
- using music they are very familar with
This is a very different setup than the rear speakers of a HT system.
So while you CAN get away with thinner wire, good quality 12 ga is available for less than $0.50/ft. And your labor in installing it is much larger than the cost of the cable. So most of us use 12 ga all around.
PS: It looks like you are planning to run 4 runs to the rear. That's good for a 7.1 system. If not, I encourage you to run at least 3 runs to the rear for a rear-center speaker in the future. Even if you dont use it, you wont regret putting that wire in for the future.
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