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.
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 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. 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.