Power regeneration - good idea? PS audio?

"I've seen a 3 volt change like that rob an amp of 40 watts of power. "

An amplifier would have to be deficient, defective, or broken for this claim and  assertion to be accurate.

And today through the snow falling I saw a monkey fly, upside down.

“An amplifier would have to be deficient, defective, or broken for this claim and  assertion to be accurate.”

Sagging voltage can reduce peak power output from an amplifier. I’ve also  encounterd distribution networks that are so stiff that they damage mechanical equipment.

An amplifier would have to be deficient, defective, or broken for this claim and  assertion to be accurate.

A lot depends on the amplifier! In this case it was a tube amplifier. Tube amps have a filament circuit and when the voltage on the filaments decreases the transconductance of the power tubes falls off- combine that with reduced plate voltage and you can see substantial losses of power. But you will see a power loss with any amplifier!

It would seem the existence of large capacitors inside an amplifier would mitigate the impact of a voltage decline temporarily.

A Macintosh amp is loaded with capacitors so I don't see any problem with voltage changes