Why worry if you speaker's minimum impedance is well above 2 ohm? Besides, you can use that ATI amp on 2 ohm loads for sure as long as you don't turn the volume up to damage your hearing first. The only exception is that some amps may have a low impedance detector that would shut down even if you turn the volume way down. I am not aware of any power amps that has such feature, but I think some do, because they want their amps to be more or less idiot proof. On the other hand, any 2 ohm rated amps will suffer from the same current limit issue if you turn the volume high enough. It is sort of (I mean to some extent) a silly game that fools mostly the technically uninformed.