Dedicated 20 Amp Line for Audio

Remember when you get ground loop hum, move the phono over to the same as everything else. 

Fremer is OK

Video on an audio forum is insulting and generally time wasting.
Wow!!
I do not doubt that you WILL go lower. Keep diggin'.

I should clarify - no RFI emanating from any wall lines around here.

high-amp:

Go with at least 12/3 otherwise maybe not worth the bother. One 12/3 should be sufficient.  Armored or conduit is necessary to shield from RFI.

The advice I followed was to do multiple lines, but to make them with the same length of wire.

I have the following:

1 line for amps

1 line for preamps, with the same length of wire

1 line for digital components

I also ran 1 for subwoofers and 1 spare.

10 awg. 20 amps.

Run the 20A line from your breaker to non ferromagnetic outlets such as from Shunyata Research and others. Then use high end power cables to good power conditioning units or regenerators of your choice. I use PS Audio PowerPlants. Then run good cables from the PowerPlants or power conditioners (eg AQ Niagaras) to your components. Extra credit for using a Synergistic Research Ground Block of some type and ground leads. Lastly, I use a dozen or wo GreenWave RFI/EMI line filter units plugged into open outlets in my listening room and around the house to reduce the overall EMI and RFI in my home. This is easy to measure with a simple digital and audio meter.