Madrigal Imaging N38 - Manual (Page 21)

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The Nº38 allows you to adjust the relative outputs of your various
sources with respect to one another, so as to avoid disturbing and/or
potentially dangerous changes in output levels as you switch from one
source to the next. These Input Offsets are made relative to whichever
source tends to be the loudest—that is, you raise the outputs of the
remaining sources to match that of your loudest source. This is
achieved as follows:
1 DECIDE WHICH SOURCE HAS THE HIGHEST OUTPUT
You should listen to several examples of each source before you
decide (
e.g., to several different CDs when evaluating your CD
player’s output, or to several radio stations when evaluating your
tuner’s output). The point is to ascertain whether any source
consistently plays more loudly than others, and to bring the others
up to its level. (For example, other things being equal, balanced
outputs of components are usually approximately 6 dB stronger
than the single-ended outputs.)
2 LISTEN TO THIS SOURCE LONG ENOUGH TO ESTABLISH ITS VOLUME
Use a particular output level setting to which you can easily return,
such as 60.0 in the display. Develop a sense of the perceived
volume at this setting, which you will want to match with your other
inputs. Optionally, you may desire to measure its actual output at
your chosen volume setting with a sound pressure level (SPL) meter
set to “Slow” or “Average” response.
3 SELECT THE FIRST OF THE SOURCES WHOSE OUTPUT YOU WILL RAISE
While music is playing from both your reference, “loudest” source
and the source you are about to adjust, select the latter so as to
give you a sense of the magnitude of the adjustment you are
about to make.
4 PRESS AND HOLD THE MODE BUTTON ON THE FRONT PANEL
After a few seconds the display will change to show SET DATA, as
below. Release the Mode button.
5 RAISE THE VOLUME TO MATCH YOUR REFERENCE
Using the volume knob, raise the volume of your “quieter” source
until it subjectively matches the volume level of your “loudest”
source. The display will show the alias of the input you are adjusting
and the degree of additional output you are assigning to it,
measured in decibels (0.0 to 20.0 dB in tenths of a decibel).
Note that “CD 1” in the example given above represents the
Programming Input Offsets