Power supply to Amplifier

Regenerated power cost a LOT more money. First the regenerator wastes at least 50% of the power it takes in to make 'new' power. So for an amp that really uses the juice up.
Second running a unit like a PS Audio regerator near it's maximum output really is hard on the unit. They work best when basically coasting along.
So...
Straight from the wall or a passive power conditioner.

A dedicated circuit is step 1. A proven power cord would be step 2. Power conditioning is step 3. Depending on equipment, sonic results vary. I like my amps plugged into a Shunyata Triton.

The right answer is, it depends. I have dedicated AC lines with their own separated electrical panel. I also have a balanced AC isolation transformer conditioner.Every component without exception sounds better when plugged into the balanced AC transformer vs directly into the dedicated wall outlets.You may or may not have similar results.
Regards,

Al is correct in that you have to have protection for when you forget to unplug (obviously the best) your equipment and a lightning storm descends up on you (it will happen). I have Brickwall unit(s) for this as well. Elizabeth is right in that you need to get the big (PS Audio P10) units so they have the umphh to drive your amps easily if....as Charles1dad says, dedicated outlets aren't possible or adequate. Living in Atlanta, a P10 made all the difference in the world for me while a nearby friend who has the street transformer right outside his house, running directly into his house, benefitted little. It does depend. (Now, how diplomatic was that!) I own seven Brickwalls and two P10's so you could say I have bought into this approach.

I use Furman Elite PFi 20 conditioner. It has very tight non-sacrificial over/under voltage protection with circuit breaker. It provides separate filtered outputs for power amps, preamps and video. I don't experience any loss of dynamics perhaps because it uses Power Factor Correction - that consist of huge inductor and capacitor. By storing energy they not only smooth-out supply current, making it look like resistive load, but also can deliver large peak currents to load (55 amperes max). If I remember correctly Elizabeth uses Furman Reference series conditioner that is even better, providing complete isolation and therefore additional common mode noise suppression.