Could be wrong, but I would think even the crudest implementation uses a filter on the ST, perhaps a single cap?
cheers,
AJ
You are most certainly right, but they didn't mention a cap- and without one that's a super tweeter that's not long for this world. Any manipulation of the signal is a variation of a crossover.
BTW, I still carry a flame for your SAM 1 speaker that you displayed at the LSAF. Shoulda bought a pair.