Velodyne SMS -1 User Manual page 33

Continue this process until the "SYSTEM RESPONSE" graph shows a +/– 3 dB response across
the bass frequencies (that is, up to about 120 Hz.). Note that this does not necessarily mean
a "ruler flat" response; +/- 3dB is typical for an optimized response curve.
An "equalized" room is shown below:
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Digital Drive User's Manual