A difficult problem in the design
of conventional stereo tone controls
is obtaining synchronous
travel of the potentiometers.
Even a slight error in synchrony
can cause phase and amplitude
differences between the two
channels. Moreover, linear
potentiometers are often used in
such controls, and these give
rise to unequal performance by
human hearing. Special potentiometers
that counter these difficulties
are normally hard to
obtain in retail shops.
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