I e-mailed you Jacob about getting one of these. I am not planning a big build, but it is definitely an awesome SQL build. I am using two RF 551x four channels, and a RF 501bd, JBL MS-8, and all powered by an XS D3400 and a 220 A Mechman alt. in my 2005 Scion xB. All active 3 way setup using HAT products for the sound stage. The sub I am replacing with the SD-2 w is a same year matching RF HE2 (chrome dust cap) 12" D4 sub. My amp's gain is all the way down as well as the gain on the MS-8 and it is pretty amazing. I want to see what the SD-2 can do with a little more power on the sub end of this setup and see how the MS-8 makes it sound. I think I want to do the box sealed and able to hit all the lows audible to our ears. Great job on this line of subs and I can't wait to get one of your products installed in my car!