I just completed a sealed AV15 build and was disappointed to say the least in the performance I was getting. It fell off the cliff under 30 Hz. Enter the minidsp and things are much, much better after applying the LT. I let Audyssey XT do its thing and according to the measurements, it's much flatter. However, it seems like I'm missing some output down low. I can see the woofer moving a lot, but sometimes I'm not getting the expected feel. This is my first sealed HT sub and I don't know if it's a function of me having to get used to the sound, or can the rooms sweet spot change once you change the subs fr?