I was trying to find out of if the 816's were plywood, but the lot sold before the seller got to the storage location to check. I would have liked to keep a pair of the 816s, and a pair of the JBL cabinets, and sold off the rest. I've got no idea what the majority of those drivers are.

Large Lot 16 of Stage Concert Speakers Cabinets JBL Altec | eBay