Dedicated power

@spenav How to wire your house for good power is excellent. It should be required reading.

Adding a whole house surge protector (or go Taurus, etc.) to your to do list something to consider.

I’d go twin 20amp heavy gauge shielded lines and use Synergistic Research Orange outlets or hospital grade outlets on up. Lots of beefy ones out there. If you do nothing else getting rid of stock wall outlets should help.

I could not run new lines but once everything from the wall out was ungraded even my wife (who couldn’t care a fig) said she thought the sound was better.

If you go with a power conditioner get a top one.

Thinking of the entire electrical supply and all wires as a components makes doing improvements easy.