Dedicated 20 Amp Line for Audio

Thanks to all. OK, I think I’m going to run two, 20’ long, dedicated lines. One for analog & one for digital. Both of those on the opposite rails to that of "noisier" items on the panel.

14/2 I presume and is Home Depot stuff OK?

 https://www.homedepot.com/p/Southwire-100-ft-14-2-Solid-Romex-SIMpull-CU-NM-B-W-G-Wire-28827428/202316379

Someone in a past thread recommended armored cable, maybe overkill? 

https://www.homedepot.com/p/Southwire-14-2-x-100-ft-Stranded-CU-MC-Metal-Clad-Armorlite-Cable-55017723/202250418

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.