"Revolutionize Your Home Audio with a $200 Rotary Subwoofer"
[Daniel Fajkis] builds a rotary subwoofer on a $200 budget by mounting a large electric motor on the case of an ex-subwoofer to spin a fan. Using the rotor linkage of a model helicopter and a modified subwoofer speaker, the fan blades pitch and create a powerful gust of air oscillating at low frequencies, providing an impressive bass experience.