I found these speakers last week, got them from an audiophile who's getting a divorce... the only hits I've gotten on them is that they were, or look a hell of a lot like the early alnico EV Sentry 10" alnicos... they are crazy powerful! By the looks of them they handle over 100 Watts a piece, the coil on them seems to be either three or four inches but closer to 4 in by the looks of the spider and the inside of the suspension. And I've just never seen a set of four 10-in speakers that were so awesome and Powerful, and incidentally quite full range! I mean up to about 3K they are pretty flat! I can't really speak to how much more they have over that because I didn't test them that thoroughly, but they are super efficient and high compliance, and the kits and everything about them seems to scream EV! Kind of like Altec a little bit, but way more muscular! But the only identifying number on any of them is 2409 on the back of the magnet! Is that ring any bells? And the fact there's four of them!