I have some questions for the Ohm experts. I have a Mesa M6 Carbine that allows for 2 ohm operation. It has a switch on the back to toggle between 8/4 ohms, and 2 ohms. At 8 ohms the amp puts out 300 watts; at 4 the output is 600 watts. When you "switch" to 2 ohms, the output stays at 600 watts, "due to a limiter circuit added to protect the amplifier" (from the Mesa manual). From my limited knowledge, it seems that if the wattage stays the same at both 4 and 2 ohms, than this amp would run cooler at 2 ohms than one that outputs higher wattage when going from 4 to 2 ohms (like almost all 2 ohm capable amps). Is this correct? Will it still produce more heat at 2 ohms, than 4, even with equal watts? If in fact, Mesa has done a good thing here, why don't more manufactures do this? I would think most people who want to run 2 ohms do so because they happen to have two 4 ohm(or a 4 and an 8) cabs...not because they're looking for more wattage.