Thank you for sharing your experience with the Lusya DAC.
I initially bought one of these DAC Hats while waiting for availability of the IQAudIO DAC Pro but was so impressed with the results that I have settled on it for my needs: PCM5122 Raspberry pi B+ 2/3B HIFI DAC + Sound Card Digital Audio Module I2S Interface Special Volumio Music PIR 2B 3|Replacement Parts & Accessories| - AliExpress
A feature of this Hat is that the 5V dc supply taken from the RPi is isolated through a DC to DC converter and smoothed on the Board to supply the DAC and Audio circuits, giving complete isolation of any digital noise or Power rail interference. The resultant sound is very pure and beats any CD Player I have access to.
I was interested on the IQAudIO Pro because it boasted separate dual Clocks but from reviews I have seen, I am unlikely to discern the difference.
I would be interested to hear is anybody disagrees or knows better. - Robin