Fallen's two 15 OEM in a ported 7.82 cu.ft. enclosure @ 26Hz, powered by a Hifonics BXi2006D. He's playing a 10Hz tone.
This is a 10Hz test tone to demonstrate the excursion capabilities of the Image Dynamics OEM. 45 Volts RMS @ 1 ohm(2000 Watts), and it still hasn't began to bottom out.