Summary: This is a great amp. The best I've ever used. 900x1 @ 4 ohms and underrated. I've only had 1 problem with this amp in owning for nearly 2 years, and it was my fault. Orion fixed it for a small price and haven't had a problem with it since. Easily the best amp in its class, as most Orion amps are.
Summary: Please do not get this amp. It is no good. I have had my amp 10 months and it has already broken unfixably. My friend got the 500.2 and it broke durig installation. They suck so dont get one. I'll NEVER buy anything Orion again.
Summary: I just got this amp brand new on E-bay. It kicks so much ass!!! Its so unbelieveably powerful. My headlights almost turn off every time it hits. Its pushin my 2 12 inch MTX Thunder 8000's like friggin crazy.