wrote:

I would imagine I could get some ready made PA system
amps.

Yes. You can get SR (sound re-inforcement as it tends to be called these days
rather than PA) amps with power rating up to about 10kW in a single unit these
days.
http://qscaudio.com/products/amps/po...owerlight3.htm

They aren't designed to be ultra-hi-fi though. Their specs are good but the main
criteria for SR use is power and light weight.

You can however get very good studio monitor type amps of the 1kW / channel
rating.

Graham