Abstract
Measuring the sidebands generated due to non-linearity when using a test signal consisting of two different frequencies has been found to be a useful way of analyzing distortion in disk recording systems. The method is more sensitive than the single-frequency harmonic method and gives results which seem to agree very well with listeners' observations. Tests made at various groove velocities with playback tips of different sizes show the expected increase in distortion at the lower velocities with the larger tips. The importance of a good fit between stylus and groove is illustrated.
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