The reason we accept the loss of program dynamics without objection, is due to an interesting psychoacoustic fact. That goal, however, has now been achieved. Thus designing a quality expander which eliminates these side effects has proved to be an elusive goal. They have included pumping, level instability and distortion â€" all of which are unacceptable. The educated ear, it seems, is somewhat tolerant of errors that occur in compression expansion faults, however, are glaringly evident. These attempts have been imperfect, at best. Over the past 40 years, many attempts have been made to develop expanders. It soon became obvious that realistic sound from these dynamically limited recordings demanded an inversion of the compression process â€" expansion â€" to restore the dynamic accuracy. In effect, dynamic reality was altered to fit the limitations of the state of the art. Where previously loud levels caused overload distortion (and soft levels were lost in background noise), the compressor now enabled the engineer to automatically make loud passages softer and soft passages louder.
#AU DYNAMIC RANGE EXPANDER FOR AMADEUS PRO HOW TO#
Compressors provided a ready solution to a major recording problem â€" how to fit onto discs, which could accept a maximum range of only 50 dB, program material where the dynamics ranged from a soft level of 40 dB to a loud level of 120 dB. In the late 1930’s, when compressors first became available to the recording industry, their acceptance was inevitable. The need for expansion in quality audio systems has long been recognized.
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