Info will eventually be ported here. AVS link for the interm: http://www.avsforum.com/forum/401-d...ass-module-your-diy-sound-group-speakers.html
The original thread seems to be gone, but this references it. https://www.avsforum.com/threads/anyone-used-the-mbm-12-from-diysg.2909636/page-2 Ryan above is tuxedocivic, designer of several of the DIYSG speakers.