I cant get the subwoofer to work. The power light is green on the subwoofer and its connected to the reciever by a monster audio cord in the line level input of the subwoofer. I'm not sure were it needs to be connected into the reciever but i've tried every possible place and it wont work. I know the sub is working because it resonates when the input cord touches a power source or my fingers. Hopefully you have some advice. Thanks