Chapter 11. Subwoofer Integration
For example, the plot below shows the left speaker in green, the subwoofer before
adjustment in dashed red, and the subwoofer after adjustment in solid blue:
11.2.3 Calculate gain adjustments
The gain adjustments are calculated from the Scale values in the plot selector. Here is
an example of a set of scale values after adjusting as described above:
To calculate the gain adjustments, assign the plot with the highest Scale the value 𝟢,
and then calculate the gain adjustment for the others using this formula:
gain_adjustment = − (highest_scale – this_scale)
This diagram illustrates for the above Scale values:
In this example, we need to adjust the gains of the subwoofers. If you need to adjust the
gains of the main speakers instead, adjust the gains of both speakers by the same
amount. (In some cases, a slightly different adjustment to each speaker can be useful
but this should only be done with careful auditioning.)
If a substantial gain adjustment is needed, it may be advisable to adjust the analog
gains in the system and re-measure. For subwoofers, this can often be done simply by
adjusting their onboard gain controls. If not, see Appendix D.
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