Well… I moved transformers and diodes/capacitors, infact everything before the regulators in a separate cabinet. The ES9032PRO dac gets ideal conditions, high speed linear regulators, discreet opamps, the ground to the PI is broken so no interference, WBT next gen sockets and now where everything else is taken care of, Cardas Golden Reference interconnect. Boy this baby can sing.
Niiiice! Which Dac are you using? Link?