Assertion: subwoofer's port | /r/Causes | slight imbalance of travel
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text: One interesting detail that can be seen is an inverse of the second and third harmonics at the port tuning frequency in the PB-3000; this may be because the port is loading the rear side of the woofer more heavily causing a slight imbalance of travel, although it is well below anything that could be picked up by human hearing.