Turn those speakers around and let's see the back's.
Does the wire come straight out the back, or are there real contact's?
Rap on the back with your knuckle's, is it a dead/solid sound or is it a kind of resonant sound, like a thin back board?
Ping, I know you have been around the block, but these are some of the question's I try to answer when I'm at the thrift store. obviously there are no marking's on the back or you would have shown them to us.
I'm stumped.......but whose surprised at that..........