Thanks for the answers. I did a little more research and found others that have had the same issue. And the solution was actually pretty simple, it was not grounded. Since the ac power supply cord is only 2 wires w/o a ground I replaced it with one that has 3 wires. I attached the ground wire to the chassis of the unit. All finished I plugged it in and no hum, turned it on still no hum, so shut it off hooked it all up and turned it on. Sounds good for the ten bucks I spent on it. Ive got a few other powered sub boxes that i have picked up from here and there, all just a piece from a system. Most common issue is the missing wire that connects from it to the receiver. I am not that savvy with electronics, but I do know enough to be safe and not fry myself or burn the house down. The question I have is, does anyone know of a site that has wiring schematics for electronic devices? If I had the schematics I could then make my own cords. Some need to be switched on by the receiver or the volume control is elsewhere, but anyway, I'm sure you all get the picture. And thanks again for the help. whatusay?
