Linear Power supplies for DACs...?

I recently made some improvements to my front end which includes a linear power supply for my CD player and battery power for my tube preamp buffer. Things have never sounded so analog. Digital glare? What’s that? I also added a VPI brick on top of the LPS transformer. Seems to help smooth things out. Strange. 

I have some great yet currently extinct power supplies for my Cambridge DAC and phono preamp..."Pangea P100s" supposedly designed by a smart person, and they are MUCH better than the wall warts they replaced...noise filtering, stable transformer based little gems.

Here’s some recent test data for linear power supplies.  Looks like no audible difference.  I was considering buying a Small Green Computer, but when I talked to the company they tried to sell me power supply magic that cost more than the server.  When I questioned the need for the power supply equipment, they reported Mac mini ports are noisy.  There is also little negative date about noisy usb and many professionals are using 2018 Mac mini’s for audio mixing.  I’m going to save my money and stick with my Mac Mini.

https://www.audiosciencereview.com/forum/index.php?threads/do-you-need-linear-power-supply-for-dacs....

+1 @steakster 

Every LPS I've had experience with has improved upon the supplied stock SMPS. 

As I've moved up the LPS ladder: improved outcomes.

Moving from stock DC cables to custom DC cables: improved outcomes.

Isolating the LPS: improved outcomes.

Changing power cables to the LPS: changes in results and when paired with the right power cable > improved outcomes.

Feeding the LPS via a custom power supply / power conditioner: improved outcomes.

I'm afflicted with a preponderance of misfortune in improved outcomes. I should read more and listen less.