This is my Premier 2000SPL running off an Alpine V-Power 600w Monoblock and a 2ohm load. The gain is down almost all the way...pushing roughly 140dB (haven't tested yet).
This setup is actually louder than two of the same subs in sealed boxes, and that setup hit 132dB in my car.
The song is Bass Mekanik - Bass Mekanik (off of Powerboxx: The Bassest Hits).