This is a used Pioneer PW-30F 11.8in woofer pair. I tried many different ways, but decided against it. I left it as it was when I got it and just connected the wires and checked the sound output.
It was a short time and not very loud, but I thought it sounded good, and I think it sounded fine. However, I don't know if it was originally like this or if it is hardened, but it hardly strokes.
I got it with no problems, but I saw one line on the edge, probably a crack, but I was afraid to touch it, so I only eyeballed it. There is an original box and one instruction manual.