For my first sub project I think I have finally narrowed down the drivers and the application. Im going to use the 1503 or 1803 blueprint drivers with a QSC amp and a BFD in a sealed enclosure. After listening to some subs with several different Qs low and high I believe a Q of .647 should suite my tastes. Question #1 - I want to see what the response curve of these drivers aftter the fs. I tried to download unibox in excel but all I got was numeric computer codes. I only want the sub flat to about 22hz so I should need to much power fo eq. Can someone help me with downloading this? Question #2 - I used the formulas from diysubwoofers.org to calculate box size, and with a Q of .647 I got 36.17 liters for the 1503, and I got 115.72 liters for the 1803. (This is why I believe I'll go with the 1503 because it can go in a tiny box.) Is there that big a difference in volume needed for these 2 drivers? Is this correct?