User manual
Page 40
SR-8100: User Manual
The Sherbourn Advanced Room Correction System™: How it works.
For the technically inclined, here is a brief explanation of how the Sherbourn Advanced Room
Correction System works:
The rst set of tones you hear (the ones that get progressively louder) are used to set an
appropriate level at which to run the test.
The next set of tones are used to determine the individual level, phase, and distance of each
speaker. This is done three times, and the results averaged, to minimize errors.
The results are then displayed.
The next set of tones are used to determine the optimum EQ settings. First, a loud set of tones
is run, and the highest response peaks are reduced. The subsequent tests, which may be run
anywhere from two to ve times depending on how much adjustment of the initial rough curve
is necessary, are basically repeats of the initial run. For each run, the result is averaged and
compared to the reference (at) curve, and each time this is done, the response peaks are again
reduced, bringing the nal result closer to the reference curve each time. Once the curve is as close
as possible to the reference curve, then the nal offset and level calibration measurements are
performed.
The nal sequence starts off with a loud burst of unequalized test signal, followed by a quieter burst
of the test signal with the calculated EQ applied. The third burst consists of the difference between
these two signals, and is used to detect any unaddressed room modes (nulls), which are then the
subject of further adjustments. The nal loud burst is the equalized and adjusted test signal, and is
used to set the nal, precisely calibrated, level trims for each channel.
The nal results are then displayed, and you are prompted to save them.
Note: The results displayed by the Sherbourn Advanced Room Correction System
are provided to give you general insight into the areas where corrections have been
implemented, and the frequency bands and ranges which are affected by those corrections,
and should not be interpreted to literally represent the correction curve itself. The details of
the full calibration process, and the resulting correction curves, are far more complex.
The values provided are actually representative of the general offset values used to
apply the corrections, and so adjusting them will produce a corresponding change in the
correction curve (so you can, for example, increase the boost or cut in a particular band by
adjusting the corresponding value in the Sherbourn Advanced Room Correction System
conguration), but they should not be interpreted as representing the entirety of the
correction that is applied, and CANNOT be copied into a Manual EQ conguration memory to
produce a Manual EQ setting similar to the Auto EQ results. Setting all values in the Auto EQ
memory bank to their at values also will NOT result in a at response curve.