Magnetic Liquids: The Ferrofluid Damping in Loudspeakers

If you blast a high-end audio speaker at maximum volume for hours, the microscopic copper voice coil vibrating thousands of times a second inside the tweeter generates intense, destructive heat. Without a way to rapidly cool this component, the thin copper wire would literally melt, permanently blowing out the speaker. The ingenious engineering solution is found in space-age chemistry: Ferrofluid....