* Sub woofers function like most other speakers.
* A coil of wire is attached to a large diaphragm.
* The coil sits on a magnet.
* When electricity moves through the coil it causes the coil to move relative to the magnet.
* This movement causes the diaphragm to move which causes the air to move, which is sound.
* Sub woofers are good at making low frequency tones because of their large size, the type of material they are made out, and the shape/size/material of the boxes they are installed in.
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