[Sammy]

If you are using 4 ohm rears or surrounds with a run in excess of 30 feet or with a lot of bends in the wire running to them, you might want to consider going to 16 gage wire, otherwise 18 gage wire will do the job just fine. That said, I ordered 100 feet of 16 gage, 4-wire stranded conductor from monoprice to go to the rears and 18 gage 2 wire stranded to go to the fronts and center for hooking up my 7.1 system this weekend. All my speakers are 8 ohms. The only reason that I got the 16 gage is because monoprice was out of the 18 gage, 4-wire when I ordered; otherwise I would have saved myself a couple of bucks by doing it all in 18 gage.