I didn't go that far. I had an electrician install two dedicated 20 amp circuits. One for the 4Bsst2 amplifier and the other for the two preamps, CD spinner, tuner, DAC, etc. I've always used oversized power cords. so didn't bother to replace any of them. I had the electrician double check the main circuit breaker panel to ensure everything had been installed by code (circuits for the fridge, heat pumps, cooktop, bathroom fixtures, outside receptacles ---it's an all-electric house!) And, checked the master ground for the house.
I took a circuit tester and checked every outlet in the house to be certain all the house wiring was correct. You might be surprised how many outlets might have been mis-wired, inducing hum.
Result? I really think it helped by ensuring clean power to the outlets. Our local power is clean and well-regulated, thank goodness
Next step: a BIT20 for the 4Bsst2 ??