http://www.photog.com/gdead/70s/Dillon/dillon8.html fits the bill quite nicely (except it's also got a copyright on top of it.)
Other WOS photos are at http://www.photog.com/gdead/70s/dillon.html For a big 270k b&w jpg of the WOS go to http://www.audioheritage.org/images/jbl/photos/pro-speakers/grateful.jpg > > Specifically, my brother is looking for the picture of > Garcia with the Wall of Sound behind him. I think he >