From this site
The three flush-mounted drivers comprise a 25mm soft fabric dome tweeter, plus two relatively small bass/mid drivers, each with 90mm doped paper cones and 130mm pressed steel frames.
The latter operate in parallel right up to the crossover point, so the operating configuration here is actually a straight two-way. All three drive units are magnetically shielded. The tweeter has a short horn flare and is surrounded by a thin foam gasket with serrated inner edge.