Hello, I am trying to design/build my first HT sub. I have narrowed down the parameters- sealed Q=0.707, tuned to 20hz, smallest possible box, most possible output I need to make this sub as small as possible (WAF) so thats why I chose the adire ada1200 since it has a built in LT circuit. I chose the avalanche 18" since that seems like the biggest/baddest/cost effective driver out there. Can someone who understands the math behind LT help me out here. If I was to fully utilize the LT circuit in the ada1200, how small can I get a sealed internal volume to still be flat to 20hz for the 18" avalanche? I know without the LT, it would take roughly 6.2^3 ft. for a Q of 0.707 sealed. Unfortunately, WAF prohibits a box that large. Thanks in advance!