Anyone else having this problem with their powered subwoofer? Whenever my cell phone rings in my HT room, my powered subwoofer turns on and hums, even if everything in my HT is off. It's not a very loud hum, but it isn't low either. It doesn't sound like something that is damaging the sub, but I'm not sure. I have tried to keep my cell phone as far away from the sub as possible, but unless I put it in another room it still has this effect on the sub. I don't want to have to miss all my phone calls when I'm in the HT room, but I don't want to ruin my sub either. Any thoughts. By the way, the sub is an Athena AS-P400 and the cell phone is a Nokia 3520.