you can try glueing


1x2's around the inside edge. I repaired an old AR2 speaker that way, for the same reason...the t-nuts were coming loose where the TOO THIN plywood edge crumbled. Alternative to flush mounting is build up the front baffle, cork panels work well, even another layer of brich ply or mdf, with holes to clear the woofer and horn flanges. Very strong. Sam


Follow Ups: