H/t: Hackaday
Waking up gracefully with the Whistle Speaker is preferable to the rumble generated by this custom-built rotary subwoofer, which just might be the world’s most powerful. Inventor Daniel Fajkis realized that purchasing a movie theater-quality subwoofer was going to be quite expensive, so he decided to build one and on just a $200 USD budget.
Unlike a normal subwoofer that moves the air around it, this rotary version uses a fan to oscillate the air instead of just pushing. This required adding a large electric motor on the case of what used to be a normal subwoofer to spin the fan, while a model helicopter rotor linkage and modified subwoofer speaker pitch the fan blades, generating air that oscillates at as low as 1 Hz. That’s right, it produces very low frequency waves (infrasound) by utilizing a voice coil’s motion to change the pitch of the fan blades.
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