Hear that?

Low frequencies are notoriously difficult to reproduce using conventional speakers, and even the best subwoofers usually peter out between 20 and 16 hertz, below which they can’t be heard but can still be felt.

These lowest ‘notes’ contribute to a convincing reproduction of certain phenomena, such as explosions or the resonance of a large hall space. Now these infrasonic frequencies can be experienced in your own home, care of one of the strangest-looking subwoofers ever invented. The Eminent Technology Model 17 looks more like an electric fan than a subwoofer, and in a way, that’s just what it is. It’s built to push air around in an enclosed space to create powerful frequencies down to 1 hertz (or lower!). It needs to be professionally installed in a basement or attic, and then it’ll be rattling your home with bowel-shakingly low frequencies.

If you do install a Model 17, then watch out for elephants banging down your door; the data on elephant attraction is inconclusive but your new toy could end up working like a dog whistle for low-frequency ears.