Dedicated power

There's a Torus on HI FI Shark today. For wire use JPS Labs Power in wall cable. It's 10 gauge but probably one of the best for noise rejection.
When I set up my system originally there was noise that you couldn't hear but it did a number on my high efficiency speakers. Brittle is the best way to describe. Very disappointing to say the least. The Balanced Power Technologies 3.5 Sig + introduced was a huge relief. Later found an Equi=Tech 5KVA wall unit. And balanced power doesn't wear out.

What most of you big gauge gurus fail to realize is that musical transients are asynchronous to the power line frequency. Low E on a bass is 41.2 Hz. The lowest common multiple with 60Hz is 6180 or every 103 line periods for bipolar supplies and every 51.5 for unipolar.

@ 120 BPM there are 30 line cycles per beat. The power supply is topped up on every line peak which almost never coincide with an audio transient.

Clean connections and no computer junk on the audio circuit solve the vast majority of power problems. Note that many wall-warts for 'audio' devices are SMPS and should not be used.

Running a dedicated line for your system is a major upgrade that does not cost a fortune and the sound can improve as much as a component upgrade.

Yes, do run 2 lines.
One for analog and one for digital.

I recently did this. I got better focus on my bass.

As mentioned no need for 30A. Run two 20A lines with 10ga solid copper. Run them on separate legs of the panel. Run the romex at least 12" apart...no staples...use cable hangers.
If the cross other lines have them cross at 90 degrees. Run them to plastic boxes. Use hospital or audio grade receptacles.

Also, when you set up your components, don't run your AC or signal cables parallel to each other. Have them cross at 90. These little things matter.