created by a device that is not harmonic with the original signal. Since
it is not harmonics of the original signal, intermodulation distortion is
often described as "harsh and grating," and tends to be more noticeable
than harmonic distortion. Intermodulation distortion is often the result
of poor amplifier design or the use of excessive amounts of negative feedback
in the circuit. Systems that are fatiguing to listen to often have high
rates of intermodulation distortion.