I have a orion hcca 12" in 2.5cu box ported tuned to 34htz I had an hifonics xx-colossus which is 3200rms at 2 ohm and my sub is dual 4 wired to 2 ohm it was loud and moving the sub but no where near the 4" excursion it should be getting. So I'm looking for an amp capable of 4000+ rms at 2 ohm. I am highly considering the autotek mm4000.1d which is 419 shipped (refurb). Does anybody have any more suggestions of amps.