Hi @stuartk
As you may recall, we have the same integrated amp. Having said that, when my very expensive Sony professional CDT died a few years ago, I ended up replacing it with a Audiolab 6000CDT. An Audioquest Carbon digital to a Denafrips Pontus ll and XLR to the H390. And it sounds beautiful. I’m not familiar with your DAC, but were you running it with oversampling? Also, is your room treated with sound absorption?