So far we have only considered sound in isolation and we have seen that sound has velocity, frequency, wavelength and reduces in intensity in proportion to the square of the distance from the source.

We may receive a commission on purchases made from links. There was a time, not so long ago, when most of us were perfectly content with our 32-inch CRT screens and their tinny, built-in speakers.

So far we have only considered the amplitude of single sources of sound. However, in most practical situations more than one source of sound is present; these may result from other musical instruments ...