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Misnomer

It should really be called a burn-in or run-in track, as the purpose is to exercise all the elements of the audio system to amplitude and frequency extremes.
The overall idea is that use of extremely wide-band and highly varied amplitude signals cover all the possible electrical and mechanical extremes the system components need to cover with music, only instead of taking the sheer time (and possible bias) that music can take, it does it faster and more evenly.

One concrete example I can personally relate to is use of such signals for getting a tweeter with ferrofluid in it's voice coil gap to "stir-up" the ferrofluid so it will behave nominally. My experience has been that when left to set for days at a time, even modern ferrofluids tend to have the particles clump and settle a bit, and the thermal and mechanical stirring of the ferrofluid with the wide range and varied ampiltude signal tends to re-distribute those particles. This allows the tweeter to move more accurately and with less "noise floor" when playing music.

Many other aspects of the system can also be "stretched" by such a signal, so as to provide a more linear response when playing musical signals.

Music can do this as well, but if the system is used infrequently, or irregularly, use of the Test & Burn-in CD tracks can speed the process, and assure that the limits have been reached more quickly and thoroughly.
Jon Risch

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