Hi Steve

Streaming Hi-Res and MQA through Tidal will give you better sound quality than CD however I am not sure if you will get the full benefit with the equipment you currently have; the 568.2mm and the DSP5ks are both fine bits of kit but are in the region of 20 years old and probably need servicing, suggest Mark Koval or Bruce at CMB Integrations as you are in the US.

I have only listened to MQA on demo through 7200/8000SEs and do not have Tidal myself, I run a Sooloos based system which no longer supports it. I am very happy with my G68/G98/MS600/C15/DSP5500s (main system).

The quickest, cheapest solution would be for you to buy another 598/G98 which will connect very easily with your 568.

Cheers
Jon