I have a Yamaha 3900 receiver and I want to hook up a FM transmitter so I can send sound to my intercom system which is close by and get cable music throughout the house. I have a Belkin FM transmitter that is intended to plug into earphone outlets. It would work fine but that means I have to have it plugged into the front of the receiver and leave the door open. I would like to hook it up in back but am not sure of the best way to do that. I don't want to damage the receiver. Got any ideas?