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Bass Adjustment
A Word About Room Tuning
The BAX-1 permits some degree of loudspeaker
tuning below approximately 150Hz. Many
competing systems provide full bandwidth
adjustments, or attempt to automatically tune
loudspeaker response based on measurements
taken by microphone. Bryston certainly advocates
tuning loudspeaker performance based on
measurements, but electrically altering loudspeaker
response is a last step, not a first step. DSP
application is most certainly not a replacement
for proper loudspeaker placement, well informed
gear choices, proper room construction and wise
room treatment. In other words, take care to
choose upstream equipment and cables wisely, and
position your speakers carefully in the room before
attempting corrections with the BAX-1. It is for this
reason we limit the adjustment window to 9dB per
band.
Further, narrow bandwidth anomalies are less
audible than wide bandwidth anomalies. Your
focus should be correcting broadband deviations
from zero before attempting to correct narrow band
issues.
Finally, do not obsess over getting absolute flat
response!
Measuring In Room Loudspeaker
Response
Though you can attempt to equalize the response
of your loudspeakers by ear, it is strongly advised
to measure the response in your room instead.
There are numerous inexpensive measurement
microphones and free software available to
accomplish this. For those unaccustomed to
measuring loudspeakers, Bryston recommends that
your dealer do the setup and calibration for you.
Enter the DSP menu of the BAX-1. Select Pink Noise,
set the level in -dB (entering 40 results in output
40dB below full scale). Press the button "Click to
Update Source" and both loudspeakers will be
6
playing pink noise.
Use your measurement system of choice to measure
frequency response. It may be useful to limit your
measurement band to 20-160Hz. Note the center
frequency, magnitude and width of any peaks or
dips.
Using the 10 band parametric equalizer, enable the
filters with the center frequency nearest to those
you wish to correct. Note that each EQ band can
accommodate the following adjustments: Center
Frequency can be adjusted up to 10Hz above
nominal for each band, magnitude can be -6 to
+3dB, and Q can be set between 1 and 5 where 1 is
broad and 10 is narrow. Filter changes are reflected
in real time. You should both hear the changes and
see them reflected in your measurements.
Monitor the graph near the bottom of the page
to see your changes. Also note that an aggregate
maximum gain of 3dB is permitted.
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