But a hackier way would be to build a parametric speaker that focuses soundwaves into a narrow beam like [Shane] did with this ultrasonic sound gun. As the directivity of a soundwave depends on ...

The design files for the sound circuit are in a Google drive ... was already shiny silver and the lens holder even fit the gun’s speaker. An old cell phone battery powers the whole thing.

A rail worker caught trying to smuggle a gun into Scotland after police bugged ... It was found to contain a music speaker - with a working Glock handgun hidden inside. The parcel had been marked ...

It is a truth universally acknowledged, that a single TV in need of decent sound, must be in want of one of the best soundbars. Go ahead — watch a movie with your built-in TV speakers ...