I like the idea of a speaker using a single full-range driver, requiring no crossover, so when Michael Tang of Michael Tang Audio emailed me, saying that one of the interesting products he\'s importing is the Japanese Feastrex driver, I made sure to check it out at SSI. There are two versions of this driver: the NF-5 ($2000), with uses an Alnico magnet, and the NF-5EX, with uses a field-coil magnet ($3000), requiring an external DC power supply. (Michael says he\'s used a car battery for this purpose.)