Did you ever figure out whether the Sony MDR6500 Headphones would work with your Panny. I have a 55GT50 and I came across your forum discussion researching the same question you had. How to
hook up the digital optical cable to a audio source when my Pioneer VX 53 only has a front the "headphone" analog jack but does have ARC HDMI to the Panny? Any in help would be most appreciated.