I have done more experimentation regarding the analog input
levels on the JE520.  I have come to the conclusion that the
"over" indicators do not accurately report ADC clipping if
the input gain is set to less than 0.0.  In fact, in most cases,
no amount of input signal will light the "over" indicators at
negative gain settings, however, severe clipping may result
in the ADC.  Positive input gain settings result in some loss
of ADC resolution; +12.0 dB (the maximum allowed) causes
a loss of 2 bits.  Therefore, optimum results are obtained by
setting the input gain to 0.0 and controlling the level externally.

That said, there should be little reason to use a negative gain
setting under normal circumstances, since the gain between the
analog inputs and the ADC is fixed requiring a *very* hot
input to overload the ADC.  Therefore, the most common
situations will require a positive gain adjustment causing slight
loss-of-resolution (almost inaudible).

When recording from vinyl, I am using a PS Audio IV preamp
which has a line output amp (after the level control) allowing
it to put out a hot enough signal to overload the JE520's ADC.
I obtain the best results by setting the JE520's input gain to 0.0
and using the level control on the preamp.  However, switching
off the line amp and boosting the level on the JE520 produces
acceptable results.

The moral of this is to beware of ADC clipping if the JE520's
input gain is set below 0.0, because the over indicators will be
unreliable in this case!


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