Hi, I have a Mac Mini (late 2012) which I use as a media centre. When linked directly with a premium HDMI to my OLED TV which then connects via HDMI ARC to a Sony STRDN-1080 receiver the surround sound from files played on the Mac Mini works perfectly. Unfortunately when I connect the Mac Mini directly to the receiver, then the files only play in stereo an the receiver isn't detected by the Mac Mini when I look in System Preferences Audio. Using Audio Midi, the speakers all work when tested. Any ideas what I need to do to get the Mac Mini to recognise the receiver and to allow the receiver to play the files when connected to it directly please? Thanks.