Text: Resonance is the name given to the tendency of any physical body to vibrate at one particular "preferred" frequency. The vibrations are greatest when the frequency of the applied force is the same as the natural resonance of the vibrating body.("Natural resonance" is the frequency at which a body prefers to vibrate.) In audio, the electrical and mechanical resonances of the various components must be controlled so that they do not affect the tonal color of the music being reproduced. Equipment designers have therefore taken great care, for example, to place the natural resonance of phonograph cartridge styli above the audible range, and that of tone arms below the audible range. Resonance also has its analog in the electrical realm, making it possible to tune circuits to various frequencies, much as an organ pipe or violin string can be tuned to a certain pitch. This is the principle by which radio stations are "tuned in." The True Sound of Music - A Practical Guide to Sound Equipment for the Home

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