Purchased this diaphragm and this is what it looked like when I opened it up. It was listed as new/unused, but I have my doubts even though this is my first time seeing a JBL diaphragm in person. I'm hoping some of you more experienced folks could help identify if it really is a 2451SL and if it looks new or used.
Personally, this thing is suspect. The .25" center dot missing its coating, the screw terminals look like they've been turned, and from other photos I've seen online, I expected the Aquaplas coating to be very smooth, while this one feels rather coarse/rough.