I'm considering using the PartsExpress for the in-wall speaker wiring and had orginally thought of their 12 gauge wire all around. However, from their description, it appears that their 14 gauge wire is "superior". So I am now wondering if I should use the 14 gauge 4 core wire instead of the 12 gauge 2 core for the mains/center ... i.e. use all 4 cores for just one channel (2 wires twisted). Any thoughts? For the wall jack I found this Sonance 7.1 Wall Jack by pure chance! Has anyone used these?