Ah, I see you've done your homework, I stand corrected... I just assumed the 600.1 was half power of the kx1200.1, guess I was wrong, and yes the mtx 600.1is correct as well, also, how does that jl stay consistent at 1.5 all the way to a 4 ohm load, that would change the amount of wattage running from it because of the ohms (aka electrical resistance), how does that amp work like that because that electrical resistance would GREATLY affect the output on a normal amp if you ran it at 1.5 then 4, it would mor than half the power output, so how does it work, in lamens terms plz...