So what if you put something on a smaller speaker coil to increase airflow? Like, a fan or something? The prototype [Chris] has rigged up is only a 300W amplifier (180W RMS), but as you can see in ...

Many readers will be familiar with the Dyson Air Multiplier, an ingenious bladeless fan design in which a compressor pushes jets of air from the inside edge of a large ring. This fast-moving air ...