I have a spare OLD SVS origional driver. (Fs 20.5hz, Qts .38, Qes .39, Qms 6.6, Vas 4.7, Re 3.2). I will admit, I have NO clue what those #' mean, but I have a couple options. 1. My bro has an old JBL that I might try to put the driver in, it is 2.815 cubic feet and uses a rear port (about 7" long and just under 3" in diameter), 2. build my own box, 3. build a sonotub to the exact dimensions as the SVS it came out of. I am hoping it will work with the JBL enclosure and this could be a huge upgrad for my little Bro, but if that won't work, I will do one of the other options. Anyone want to help me out?