it is a speaker to put in your car at the drive in movie. i am under 50, but there was a drive in in the town i am from, for a long time after most disappeared.
damn. You are right. I had the hanging part right but never got to go to the drive in where I grew up. It played dirty movies so it was off limits to us. Good one Okie This is getting hard to stump anyone. Your shot Blondie.