Bought a set of Digitech AA2086 headphones. Salesman suggested we should be able to get the headphones to work as required. Trying to use with Sharp TV. Purpose to have one person (Hearing issue) using headphones and others able to hear TV volume at same time. Can get the Headphones to work with Audio socket, but only headphones work. Cannot get RCA cables to work. Is there another attachment I can use.