For sale is a vintage Jensen speaker driver. I think this dates to the 1960s and is a model EM1501, 15" driver.  I believe these came out of a guitar amp, as this came from the estate of a man who liked guitars and had amps and other things. This particular one has some decay to the dust cap. It is sold in "as is" condition as I haven't tested it, but it looks like it would work. It would be a great addition to any collection!