They're an ancestor of the Fostex FE103, apparently, but with alnico magnets. Rated for 2w continuous, 8w peaks. Good thing I'm planning a 2A3 amp!I've seen discussions on FE103's, FE103E's, RS1197's in BR, Voigt Pipes, TL and back horns, but nothing really on this driver. I'm leaning toward the back horn Fostex recommends for the FE103E. Kinda wish Madisound made a flat pack kit it . . .