12 sub in slot ported 3 cu.ft. enlcosure @ 37Hz, powered by a Legacy 2488 amp. He's playing Bass, I Love You by Bassotronics and test tones.
aka the fartknocker sub
mr_malina's two 12 XD in a ported enclosure @ 25Hz, powered by a American Bass XD1000. He's playing No Problems by Lil Scrappy.
Much easier to see the excursion in person. 75wRMS each.