Hey everyone! It's been a while since I've posted here! Anyway... On the factory frequency response graphs for just about every Eminence woofer, there is a huge dip between 40-50hz. Is there a reason for this? Most of the drivers have an fs of 40hz or below, and the dip is usually higher than that. When designing a box, should I assume the driver's usable response goes down to the fs or down to where the chart shows the dip?