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Problem formulation
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If subwoofers in fact have very different capabilities, it is recommended to separate them into two or more different channel groups. This will allow each group to maximise its performance without being limited by less capable individual speakers in the same group.
It is recommended to enable the infra bass bypass option on channel groups that can play down to 20 Hz.
It is recommended to not enable the infra bass option on channel groups that cannot play down to 20 Hz.
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Figure 1: Bass response with infra bass bypass option disabled. | Figure 2: Bass response with infra bass option enabled. |
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Figure 3: REW measurement showing infra bass bypass ON and OFF. The best infra bass response is from grouping the most capable subwoofer(s) in a separate group. The orange/purple/blue contain different subs in the same group. |
Limitations
There is a chance that the crossover band between the infra bass and the ART region does not add up perfectly, since the infra bass part is not phase corrected. This may show as a small bump or dip around 20 Hz. However, such content cannot really be heard, but rather felt in the body, so it should not reasonably have any impact on the audible experience.
If the bump needs to be reduced or removed, it could be done using the advanced target curve editor, adding a corresponding notch in the target response.
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Figure 4: Ripple bump at 20 Hz due to enabled infra bass bypass option. | Figure 5: Mitigation of the ripple bump by adjusting the advanced target curve with a corresponding small notch. |