Rich and I are still working steadily on our driver designs, and hope to be able to offer them for sale within a few months. We are about finished with the design of our DS-1428 mid / high frequency compression driver, which is based on the RCA MI-1428B of the late 1930s. We are also developing the DS-1448 bass compression driver, similar in design but scaled up in size. Our horn designs have been evolving as well. Stay tuned!