but it uses an immense amount of power to move a giant speaker coil. So what if you put something on a smaller speaker coil to increase airflow? Like, a fan or something? The prototype [Chris] has ...

Like the voice coil of a speaker, the amount of current determines the amount of movement. Voice coils replaced the stepper motors on floppy disk and earlier hard disk drives. See hard disk.

Another top subwoofer you can buy on a budget is the 10W0v3-4 Subwoofer from JL Audio. Packed with a 2-inch diameter voice coil and a specialized cooling system, the subwoofer delivers ample power ...