Thanks Russ

Yes running 8.1 still a distinct difference in SQ.

There is a lot less bass with Stereo engaged and I have the 861 setup as just 2 channel at the moment i.e only 2 speakers in Mconfig

Everything goes soft squidgy and blurred by comparison

Clear as day.

However I have not set the correct distance yet. I will do that when setting up the full AV.

861v4 LPSU, HD621, Bryston 9BSST
KEF Reference 3 and 2c, 2 X SVS SB13 ULTRA
Audio PC: JPLay, LPSU, JCAT, PPA Studio
Cables XLO Limited, Unlimited Edition and Signature
Sony VW500 Isotek Titan, DIY Mains and Clean Signal Earth Solution