I have recently been reading up on using Linkwitz Transforms to flatten sealed subs. I'm wondering how well a BFD can be used in this way. I know they don't have any filters below 20hz, but can you use the Fine and Bandwidth settings to reach below 20? Also is there anythign I can use to model the effects of the EQ on things such as the excursion and SPL of the setup? I want to be sure I'm not going to be pushing my driver past its limits. Right now I have a large(143l) ported box taking up quite a bit of space in my room. If I can get the size down while not loosing too much extension or SPL, both me and my wife would be very happy.