I just called AMPEG. All 810e are and were made with Void-free Bircg Plywood, just as advertised. He said MAYBE, repeat, MAYBE some cabs made in 2000 MIGHT have been made from MDF, but there's no record of that, AND the VAST majority were made of Plywood. Ampeg says, just pull off the grill and look. Plywood. I don't know why somebody would start saying this non-sense, but, really folks if you hear something crazy here, or anywhere, you should check it out, like I did. They advertised (13?) ply void-free Birch Plywood...can you think of the Law-suits? Can you think of how heavy MDF, (OSB?), would be? The same goes for the People who say certain years sound "dark"...I've had a bunch of these speakers, and what I dial in,(EQ. in), is EXCALTY what comes out of these great non-ported Speakers. Like Ampeg says...just pull off the Speaker grill and LOOK.