I have been building a home theater in my basement for the past 3 months. I am at the stage where i am running speaker wire through my ceiling. The speaker gauge is 12 awg from blue jeans in wall rated. I do pass several electrical lines that are in metal conduit. I am not getting a humming sound which is what i was expecting because of the power lines. Its only noticeable at extremely low volume settings and i can't tell if its there when i turn up the volume. Maybe it has always been there, but i now only notice it because i was looking out for the hum noise of the power lines. My speakers are Polk LSI9's. I do notice a big difference in power from my carver amp with the new 12 awg wire. I was using 16 before.