Have just received these wireless headphones and not too sure about the set up, would be very thankful for some expert advice. Basically I have connected the optical to my Denon AVR3311 which then feeds to the base of the headphone dock. Now I'm not sure if this is right as no sound through the headphones. Do I have to do some assigning on the receiver to get them to function? Thank you in advance for any help you maybe able to give me.