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As the input increases above threshold, the output takes the shape of the de-emphasis curve. When both pre and de-emphasis are switched out, the Model 722 works exactly like the Model 720. RCH DENSITY - adjusts RANGE - when switched the Relative Crest Height to the “.10” position it adds ach (RCH) of the output. a 10dB boost in the input The higher the RCH and a 10dB cut in the and of (clockwise) the louder the output. The PEAK CEILING output. The lower the is therefore 10dB lower nnel RCH (coun