Whilst I can’t directly help here, I currently use a D2 and the H360 - I’ve commented elsewhere on my experience of comparing the DACs. Afaik, the DAC in the H390 is the same as the H590, except it offers MQA on all inputs. My arbitrary guess would therefore be that the H390 DAC is likely ‘better’ than the D2 but I suspect on the basis of my H360 experience that the D2 outperforms the H190 when fed to balanced inputs. Take all this with a very large pinch of salt though - I have no specific knowledge!
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