Hello Everyone, if you have read my previous posts you know that I just picked up a used Klipsch RW12D yesterday. It sounded great at the persons house and sounds good at my house but when I am at very close range to the subwoofer or have just the subwoofer on alone I hear what I can only describe as what it would sound like if there was a wire or piece of trash touching the cone. I don't know if this makes sense. There is plenty of bass coming out of the sub. I played The Polar Express and at the begining with the train scene the entire house shakes but when I get within 12-18 inches from the sub I can hear a little rattle. The rattle sounds like as if something was touching the cone. I openend it up and there is nothing touching it. I push the cone in and out by hand and don't feel any rubbing. It is only when the bass hits. Any thoguhts? Is the voice coil going back, could it be a setting on my receiver or sub its self? I have it set to 80hz. I tried a different wire.