While chasing ground loops and induced power supply noise from other devices, I found a computer power cord with a ferrite noise block on it worked well to keep interference from my CFL and LED table lamps out of my WA3. I'm not a believer in exotic power supply cables....the power generated from the plant traverses the country on unshielded naked cables of copper, aluminum, and gets switched through buzzing arcing knife switches at every street corner. When it finally comes into the house it rides hundreds of feet of unshielded parallel 14ga romex throughout all the walls with other stuff on the circuit generating spikes and noise. There is nothing clean or sacred about the power at the wall. The most impactful thing you can do is keep the noise out using a power conditioner, filter, or at least a choke. WA3 ties signal ground to chassis ground and it goes through the power cable to earth ground....it needs to be filtered. As for silver unobtanium power cables......what about the other 60 miles of the circuit?
Isolation is the key.
This makes total sense to me. And particularly on my phono stage-- it's why I'm going to power it off of a battery (my phono stage manufacturer makes a battery specifically for this purpose). It makes sense-- and it is 'perfect' isolation. Will it improve bass or imaging or soundstage? I don't know. I suspect it won't. But I do know it will eliminate hum. And that in and of itself will improve the sound. I'm not changing the power cable.