Just as an FYI, the Sony wireless headphone system is installed and pulling TV audio using the Optical Audio Out on the Direct TV’s DVR box (I found this Audio-Out source when installing the headphone receiver.) I see no reason why a Streamer would not work exactly the same if a TV/DVR (only) connection is needed.
FWIW, with the DVD and the WD box, the Sony headphone’s dedicated receiver is wired as a pass-though to the A/V Receiver (DVD Optical-Out to HPhone receiver to AVR Optical-In). But I did a direct hookup to the DVR’s audio out (not running through to the A/VR). I get no perceptible sound delay, however my son thinks he picks up a little.
Sound quality from the Sony HP System is outstanding (even I can pick up the surround sound) and far far superior (to my ears) than the demo Streamer’s sound quality. With or w/o the hearing aids. The only draw back is it needs more room in the ear cups if you are using behind-the-ear shells, like the Costco 5.0’s. Feedback can also be a problem if the aids are not turned down quite a bit (although I think the gain is set too high on mine right now).
He likes it enough that we just ordered the newer HDMI version of the Sony HP System for him. (The newer system has to be sourced directly from Japan, but Amazon handles the paperwork.)