Technics makes some fabulous 4 and 8 inch full range drivers that are only sold in Japan. I have a pair of 4 inch that the model number escapes me, but really sound great in backloaded horns. I also have used, and are my absolute favorite, are Telefunken 8 inch full range. I have used many Fostex and Altecs but for my taste the Tele's kick serious butt. Tim