And now for something COMPLETELY DIFFERENT. How about an electric fan subwoofer? Sound far-fetched? Well, here it is from Eminent Technology’s Bruce Thigpen. How does it work? The motor spins the fan at 1000 rpm. The blades are flat with no signal and do nothing. Fast rotation causes them to couple to the air far more efficiently than a cone. The angle of the blades themselves is changed according to the signal by a 15” woofer magnet and voice coil causing them to quickly blow one direction then the other as the voice coil, attached with a mechanical linkage, directs. With a DC input, it makes an excellent $12,900 fan. The result is a transducer capable of response flat from 25 Hz down to 1 Hz at earthquake levels (over 110 db) even with a 200-watt amplifier and with decreasing distortion as frequency drops. After hearing this invention with several film soundtracks I think I can safely say that it has truly gone where no speaker has ever gone before, and with plaster cracking force!