My problem is similar but a little different. I have Sennheiser RR840 wireless earphones where the base unit is connected to my Comcast DVR RCA outputs. That works pretty well. I even have a separate set of RCA cables attached to my BlurRay player which I switch to the Sennheiser when i watch DVD disks. (I have to switch the DVR input 3/8' cable end for the Blueray player when I watch DVD disks.) However, when I recently connected my internet cable to my TV in order to access Internet media such as Netflix I lost the sound from the Earphones. Not too surprising since the sound output is then coming from the TV's speakers but not available to the Earphones when I would like to use them because the only audio output is digital and the Panasonic outputs Dolby Digital from ATSC channels and only outputs PCM from NTSC Channels. It appears that since Comcast went totally digital that the output would be Dolby Digital and I would need a DAT that converts Dolby Digital to PCMAnalogue two channel stereo.
I am very much a novice on this subject so any comments as to a solution would be helpful. If I can get a DAT converter (and cable) that will work with my Sennheisers, I can even remove the two RCA cables I am currently using from the DVD and DVR units. Any comments would be very much appreciated.