In musical reproductions there are no pure sounds, but a set of simultaneous vibrations that influence each other, giving rise to intermodulation distortion. New vibrations appear equal to the sums and differences of the originals in the event of intermodulation distortion. Since musical sounds are usually composed of a fundamental vibration and a series of harmonics, and in an orchestra or ensemble there are many instruments playing at the same time, the intermodulation distortion is very annoying in the reproduction if it exceeds a certain value that we can situate in 0.5% for the cartridge, as maximum admissible value.
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