Dedicated 20 Amp Line for Audio

Both of those on the opposite rails to that of "noisier" items on the panel.

that's fine, but make sure your 20A audio lines are ON THE SAME 110V RAIL/LEG.

Also, I would not use 14/2 Romex or stranded wire.  You really need 10/2 Romex (Romex is always solid-core which is better than any armored stranded wire).  If you can't do 10/2, then 12/2 is acceptable. 

I don't know that you need a separate 20A line for each device like hilde45 recommends.  It's all about current draw.  You could probably run all source/digital components on one 20A circuit just fine.  The other 20A would go to amplifier only. 

That being said, I have six 20A circuits run to my room.  Each amp circuit only has one or two amps, but I'm totally overkill on my setup.  You can probably run two small/medium sized amps on one 20A circuit just fine.

Another option:

https://www.vhaudio.com/wire.html#bulkacwire

VH Audio sells cryogenic treated 10 awg romex wire.  It's a lot more expensive, but if you want the best that's the way to go. 

I am not currently running cryo-romex in my setup at this time (maybe in the future).

He needs 14/2 for 15 amp, 12/2 for 20 amp. He does not need 12/3...that includes 3 conductors, one of which is red. Both 14/2 and 12/2 contain the ground, it is not counted in the number designation. Keep it at one circuit run to avoid ground issues/loops etc. To assist in noise, buy at least an audioquest Niagara 1200. I’d also buy the audioquest Edison outlet or a furutech, beryllium-copper. I would top that off with a Fuutech faceplate designed to block rf signal interference...I also run a seperate furman power conditioner for all my low draw stuff. Only power hungry components are on the niagara...this also frees up plug space. Both of course are plugged into the Edison outlet. Don’t forget the power chords to complete this....I use AQ thunder, Z3, and X3 throughout. Also a Nordost blue heaven on my Technics TT.

I have GoldenEar Triton Reference powered speakers. 1800 watts each (15 amps). I installed a 3 gang duplex receptacle with 3 separate 20 amp circuits to my panel. Separate power and neutrals, one common #10 ground. Plenty of power, No ground loop issues.

@millercarbon 

Thanks for sharing the Fremer video...unlike some others here, I thoroughly enjoyed it....