Is the sub plugged into the same AC outlet as the other equipment, or a different one in the room? I had a similar problem when I had my twin 350's plugged into a different outlet for whatever reason. \:\)

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85