@whart agreed.
I pulled a single International Projector Co. Horn and folded cab out of an old theater in my town. After some clean up, fresh wire and some sanding, in a word wow!
Friends and family are simply blown away not by it's size, but it's sound, in mono no less.
I'm getting the feeling that we in this hobby spend a good deal of time chasing the new and shiny (myself included), whereas sometimes there's a hidden and unused gem somewhere. It might just take an enjoyable mini adventure to find it. That and a little elbow grease.
Cheers
Doug