How do speakers work and where is the latest tech heading? Rory Reid is at the University of Warwick, where he learns speaker technology has changed little in 100 years. Dr Duncan Billson demonstrates just how simple a rudimentary speaker is to construct - using a little copper wire, a sheet of cellophane and a magnet. But finally the tech is changing… At Warwick Acoustics (a company spun-out from the School of Engineering) electrostatic technology is being used to make £5000 headphones for the most committed audiophiles, but the wafer-thin tech can also be used to mould speakers into any shape or size - including (of course) a special speaker for The One Show. Then Rory puts an ultrasonic directional speaker to the test with the help of two flamenco dancers.