what gauge wire ?

[E-Stat]

14g is an industry standard for the most part, so for surrounds and so forth - yes 14g is fine for the lengths you're talking about. If you have full range towers up front use 12g for them and keep the lengths of wire the same for the R and L.

For simplicity, one can get the same effect (actually 11 gauge) by biwiring the mains with the same 14 gauge (if speakers support such a connection).

rw