@rshad0000 I know you will be impressed.
It's not debatable and not a nuance- its obvious.
While isolating the 5V line is a good idea- too much surgery for this DAC I'm capable of doing it but not interested in attacking the board on a product of this level.
Many of my audio experiments over the years have been power supplies- when you get them correct - there is always a positive difference in my experience.
Good luck.