MDR-DS7500 cans with Pioneer VSX-1122 AVR (optical cables are not necessary)!
Everything is working great, and I've owned these cans for about two years. The setup I use follows the schematic on page 17 of the manual: Time Warner cable box > HDMI > Pioneer VSX-1122 > HDMI > Sony transmitter > HDMI > Samsung HDTV. Although the schematic shows two optical cables connecting the; 1) HDTV optical/audio OUT to Sony transmitter optical IN...and 2) Sony transmitter optical OUT~through to the Pioneer VSX-1122 optical IN, these are not necessary for my setup! Once I've powered my main components on with the Harmony 600 remote, then I power on the headphones & transmitter by putting them on my head. I then click the devices key on the 600 to bring up all of my components on the 600's menu window. I then select Pioneer 1122 and navigate to the HDMI audio THROUGH OR AMP 'boxes' which appear on the 600's menu window and click THROUGH and presto it sends the signal/sound to the cans! NO optical cables needed because the HDMI cable from the AVR to the transmitter delivers the sound! Another thing I think occurred ( but cannot remember exactly) is when I had another setup working good (on page 16...NOT 17), is where I've had sound from BOTH the AVR fed surround speaker & the cans. I will report back once I've experimented with this particular setup....I hope this helps!
Last edited by beerhunt; 03-18-2016 at 06:21 PM.