Why not batteries instead of power supplies?

I'm surprised nobody has brought up or suggested supercaps.

I think voltage rating is too small for them to be used as poweramp supply caps. Only 2.7v unless that's changed in the last year or so.

Cheers George

Cost!
http://www.mouser.com/Passive-Components/Capacitors/Supercapacitors-Ultracapacitors/_/N-5x76s?P=1z0x...

Wow it’s been a while, since looking at them. And you can get 48v 83 farad for a "cheap" $1,300 each you’ll need two. Great ESR as well,can you imagine the inrush current!!!!!!! No BS boutique ac voodoo fuses here, you'll need massive circuit breakers
http://www.mouser.com/ProductDetail/Maxwell-Technologies/BMOD0083-P048-B01/?qs=sGAEpiMZZMuDCPMZUZ%252bYl9uUUNJQGTDeS0ZKH5mj4e4%3d
Wonder who’s going to be the first linear amp manufacturer to start using them, my bets on Dan D’Agostino .

Cheers George

If memory recalls, I think Vinnie Rossi already uses this technique in his LIO amp, one of the reasons why it sounds so good. Two sets, one set is used while the other is charging and they switch back and forth as needed.