There was a little sheet included with my subs showing how bass extension was increased at the cost of total SPL when one used the included port plug. But for the 16-46CS+ (my model) it also shows that using the plug causes the driver to exceed it's linear excursion limit in, I think, the 20-25hz range. How big of a problem would this be? Would it be more likely to bottom? Would THD increase? Any other concerns? Thanks!