if that is a store demo unit thingy, then I am thinking it is daisychained from a main 3 wire signal feeder cable, one side of the screw terminals will be input and one output to another of these rack mounted units to feed the source into them. Though which mirror imaged terminal hookup side would be IN and which would be OUT you may have to post pics of the PCB board and setup.
Of course i could be wrong but it is the only thing I can think of with the arrrangement seen in the pictures.
Man am I curious. For that price even a cmoy is hard to come by, and unless you hit up a decent garage sale or thrift store...
Gonna be interesting to see.
and don't quote me on that, just what I can figure. GOOD LUCK!!!!
Edited by nick n - 2/4/13 at 11:16pm