Engineers show us the key components in a loudspeaker and explain how they work. A speaker consists of a number of constituent parts including the drive units, the crossover circuit, the cabinet, the tweeter, the mid-range and the woofer. The crossover filter feeds different frequencies to the appropriate drive unit. In each drive unit the signal makes a coil vibrate in a magnetic field, which moves a cone to produce a sound. The cabinet is an essential component in producing the final sound. We see how the speakers are tested before being dispatched.

First broadcast:
11 June 2009

Could be used to demonstrate a practical application of electronics or as a starting point for a design exercise. The class could discuss the main needs of the product (space for two speakers, the 'splitter' circuit, enclosed case).
Students could then generate design ideas for a speaker suitable for a nominated end user with specific requirements; these could be related to size, style, portability or other factors.