So what if you take that same amp set it for 63.2 and have a subs wired for 1 ohm you going to get almost 4000 out of a JL 1000?
I think i got it...
The double down rule of amps is based on the ability of the amp to supply the necessary current off of the battery current.
If you stay below the car's electrical system's limits, and your amp's power supply is 100% efficient then yes, Wattage will double with 50% drops in resistance.
However, If you surpase the cars electrical system, you reach a cap on wattage output.
You also get diminishing returns because the efficiency of the amps power supply is not 100%... so even when you are below your car's electrical limits, the power supply has limits...
Notice that the stronger amps with better regulated power supplies are more expensive. The better the power suppy, the better all around the amp.
In the case of your atomic... you have a sturdy amp that can remain stable at .5 ohms, but that doesn't change the fact that you are either not getting the required amperage from your car's electrical system, amp's power supply, Or more likely, BOTH.
However, this doesn't change the fact that for his amp to be putting out 2200 watts at 2 ohms he would have to see AT LEAST a voltage of around 66 volts