Join Date: May 2002
Location: Bremen, Germany
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All plasmas are aging day by day. To ensure equal image quality over time, all manufacturers use an automatic Adjustment Circuit to compensate the this aging process.
Exception: you perform a ISF calibration and save the settings. Thus, you will have the same deep black levels, but the overall picture will be getting darker and darker over time. After a few years a new calibration has to done. The black levels will never be as deep as at the first calibration.
All Pioneer, Samsung or Panasonic plasmas without a possibility of a ISF calibration will rise its black levels with the time.
Do you really believe that a Pioneer Plasma after 5 years of use will have the same black and luminance levels like on the first day?