Thanks for the suggestions!
- That sounds like a plausable solution, though I wonder if it will hit any HDCP 2.2 issues if the de-emeder doesn't support it? Guessing so, wonder if I can get an HDCP 2.2 compatible de-embeder, possibly as their seems to be a load of HDMI 1.4 compatible ones.
Yes you are correct in that it would be considerably easier if the applications would just output vanilla DD from the device if the sink indicates it doesn't support DD+, but it seems that Netflix and Amazon are now only supplying DD+ streams to the end device (apart from some specific TV's), and in their wisdom Nvidia decided to not include a DD+ decoder in their box to allow it to convert the stream to DD before outputting it (which is what the Amazon fireTV boxes are capable of), so it's a bit of a rock and a hard place situation.
The AVR is a Sonos playbar setup, which is part of a much larger Sonos system in the house and they don't want to loose the integration. I understand it, but yes it would be so much simpler to replace the AVR, but it would also mean changing all the speakers, wiring e.t.c
What we really need is for Sonos to bring out a suitable overpriced box with HDMI on it that decodes and sends the audio to the Play Bar, but they seem to be dying a slow death at the moment so I don't think that's going to happen any time soon.
Good shout on the HD Fury Integral, will give them a should and confirm that it does the job, hopefully one of your solutions will work . . .
Thanks for the help, if anything else pops into your head do let me know!