How about a 4 wire 20 amp dedicated circuit I did one common ground ,one a insulated isolated ground on its own busbar, big improvement
every connector in my Audio Chain including power chords and all connections in equipment either WBT, or Furutech ,it took me over a year all gold over high purity copper. I very substantial improvement ,most equipment comes with gold over cheap brass conductors ,and $3 IEC inputs I useOnly Furutech ,and Synergistics
research purple fuses which I only use 2 As big or bigger then the dedicated 4 wire 20 amp circuit. Copper is 3 x better conductor then brass and far less resistance.