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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 despatched.
First broadcast:
11 June 2009

Classroom Ideas

Could be used to demonstrate a practical application of electronics or as a starting point for a design exercise. The class could identify the blocks in a systems diagram representing the product: the input from the amplifier or music system, the process (the 'splitter' circuit), and the output devices (speakers). Students could then create a specification for a set for speakers for a nominated end user with a distinctive 'style', such as a teenage Goth, an old person living in a castle, an astronaut, a small child, etc. This should incorporate the identified systems blocks and any other requirements, such as the enclosed case. They should then sketch a range of creative design ideas that satisfy the specification.