Stumbled on this today... how about 26,400 watts RMS?

http://www.dozin.com/wallofsound/index.html

A very small taste of what is at that site...

Quote :

The Grateful Dead sound system is really 11 independent systems or channels as shown in the table below. The source of sound are located behind and above the performers so they hear what the audience hears. Only one source location for each channel is used to cover the entire hall and the music is clearer both on stage and in the audience. The stereo effect is very satisfying and natural to persons all over the hall. Intermodulation distortion between instruments is of course non-existant.

That's pretty awesome, E. Looks like the systems for vocals and piano are suspended instead of being set on the ground. That has to be purposeful I would imagine, as they could easily widen the stage... space cannot be an issue. I mean, they're the Grateful Dead. I wonder what the difference is and what the purpose is, exactly.