Onkyo TX-SR803 Receiver "zone wireless headphones" Questions

...Wireless Headphones into the 1/4" Jack, and insert the RCA Plugs into the Zone 2 Output on your Receiver and your dreams will be realized. Instructions and information on Zone 2 may be found on page ...

...Zone-2, it has both speaker (powered) output and pre-out line outputs. According to Yamaha FAQ, these pre-out outputs are independent on the main volume settings. So if your wireless headphones have ...