“MQA is a philosophy”..John Stuart

There were many attempts to improve sound, like HDCD or SACD but all pretty much failed.  They had one thing in common - a strong copy protection.

Myself, I don't care for MQA since I don't see sound quality limitations of existing media.  I have few CDs with breathtaking sound proving that the format is not the bottleneck  - at least for my old ears.

Jafant, It is in my view.  I cannot use SACD with the server and don't want to invest in two different formats, CD being dominant.  In addition 90% of CDs I have are not available in SACD or HDCD.  I realize limitations of CDs (Nyquist applies only to continuous waves) but it is good enough for me.