@Graydee
It took me about three reads, but I think I figured it.
A Pro box in Surround Mode will output Dolby Digital Plus.
(e.g. that’s the only encoding it uses, and no option of DTS etc.)
And:-
a programme in stereo will be output in stereo;
(e.g. what you observed, and if this was a stereo programme then only getting stereo out is by design, and not a fault)
a programme in 5.1 (surround) will be output in surround;
(e.g. if you can find a programme in 5.1, on Netflix for instance, or maybe even a Freeview broadcast of a programme in 5.1, then you should get surround OK. You can try this).
And the bit in italics describes that some devices do, or can, muck about with stereo to get a fake 5.1 effect. The Pro doesn’t, but maybe you can set the DN1080 to do this.
The interesting bit is your observation that you had ‘no problem’ getting surround out of your old BT box.
There are three possibilities:-
You never played any stereo programmes (very unlikely).
The older BT box did muck about with stereo to give you fake surround sound;
The Pro box isn’t playing 5.1 surround correctly.
I suggest you do the test I described above to see if a known 5.1 source does give you surround from the Pro box.
And maybe ask on that BT thread if your old box (give the model number) is one of those devices that mucks about to give you fake surround from a stereo signal.
I await your findings with interest.
My favourite bedtime reading is a Sony product manual…
