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DIY Sub-Mic

Somewhere in your collection of gear, you might have an old guitar amp, or a blown pair of speakers lying around. If you can salvage an intact (unbroken/blown-out) speaker cone, you can make your very own sub-mic for next to nothing. Speakers and dynamic microphones are made with some of the same kinds of components: the sizes are different, and signal flows in opposite directions. One converts sound into signal, while the other converts signal into sound. Wire them backwards, and you can turn one into the other. Wiring a speaker backwards will turn it into an extremely large-diaphragm microphone,…

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