I solved it (sort of) the Mac restricts the audio quality as it sees the projector as an endpoint rather than splitting out via the amp. Thing is it works fine via an Xbox , Apple TV but there you go. In the end I bought a iFi Zen DAC which I connected via the USB with a bit of tweaking now got it playing MQA at max rates from Tidal via Roon and it sounds great. The Mac mini is an endpoint and is an old 2014 (non upgradeable one 
) with 4mb of RAM but it runs just fine. The Core is a 2012 Mac mini running 32mb of RAM and a 512gb SSD and manages that all fine as well. As a newcomer Roon did need a bit of a learning curve from a configuration point of view but with the Zen DAC its sounds amazing.
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