Which amp to choose for orion hcca?

You would be running it at 1 ohm, so I would go with the Hifonics or maybe the Audioque... I used a Rockford Fosgate T1500 and it pounded that sub, but you could even do a T2000... That sub is power hungry... The best amp for the price, is the Hifonics, but they are very power hungry amps, so you are probably better off get a more efficient amp...