Be careful with Earthquake. None of their amps were really stable at 1 ohm very well. A bunch of folks had issues with their amps even with correct voltage.
I ran mine at .5 ohm daily but I had my gains set at about 1/2 way and I had no issues with it but I found it to be overrated as I gained (if I can remember) 2.7db when going to an RD 5750.1 I sold mine to Cam (on Ecoustics)and it's been treating him well!
I heard about many people smoking this amp while others have had no issues what so ever.
whatever happened to earthquae my broth in law used to always talk about it he had 2 15's not sure what kind, and 2 shredder amps, that was about 7 years ago, people said earthquake went downhill, does nebody know what happened?