Does anyone often plug or unplug the ports on their subs, depending whether they are listening to music or HT? I have gotten into the habit of doing this, to avoid the high group delay with my large vented Tempest. Modelling in WinISD I see that the GD is much lower, but the max power also drops a lot below 30hz. Respectively, the cone excursion goes VERY high below 30hz. Am I risking damage when I plug my ports? Or is 150+ liters just too large for a sealed enclosure?