Sorry, I couldn't even venture a guess but these are kind of relics by todays standards. I'm sure its huge in a road case.Most people use a sub/top kind of set up. It's also more difficult selling one speaker than a pair.
But the EVS were great sounding boxes. Perfect for Keys. We had 2 of them in our showroom at Dyno-My-Piano.
Sometimes you can check EBAY and click on "completed listings". If any of these have sold recently, it will be listed there with the selling $. Good luck
JP