Your in Austin, ay limniscate? Check out an ol’ pal of mine from San Jose, Cornell Hurd. He fronts a Western Swing Band, and plays around town regularly. Cornell’s a great songwriter---Junior Brown for one has recorded a song of his.
Regarding calling Rythmik, for the OB/Dipole sub you want to call Danny Richie at GR Research. He and Brian Ding at Rythmik collaborated on the sub, but it’s Danny’s baby. He’ll tell you all about it; Brian Ding sells the DIY kit, but recommends his own sealed and ported boxed subs in preference to the OB/Dipole. You probably already know the G in your F12G refers to GR Research. The G woofer has a paper cone, the standard F12 an aluminum one. Danny feels the paper-cone woofer provides more resolution and a more natural timbre than does the aluminum.