The Best upgrade for digital

I personally have done many upgrades with capacitors
power supplys and have owned 4 different brands of clocks and regulators the Best my a Large margin is a new one
Called the Terra Firma Lite Bit clock ,and their flagship the Uberclcock. These clocks and power boards have made more of a difference than any combination of things in the digital chain many people use the term Analog loosly.
I now feel I don't miss records all that much now when playing a cd or sacd.
With These clocks I have found out The Swiss designer
went back and discovered many parts of the noise in the low freqency has not been addressed Just digital jitter the Crystal ocillators themself produce noise in the signal path . My technician on the East coast gave a better price and included shipping ,beware of who you go to a few have horrible feedbacks without mentioning names down south.
There are plenty of customer reviews and articles in positive feedback online.