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It is not a contest and we're both right

The question piqued my interest and a dove straight in without noticing John's answer. He is saying that at the output level to give 4W into 8ohms if you half the load to 4 ohms the power will double as it is a classA/B amplifier that can increase output current on demand, within the limitations of its power supply. But if it is was a 4W into 8 ohm class A amplifier the maximum output current is fixed and as the load decreases the amp cannot supply more current to maintain the voltage swing and you would get current clipping. The most power it could supply into 4ohms before clipping would be 2W. So the classA/B will double the power into 4ohms but now it leave the classA region at 2W instead of 4W.

Regards,
13DoW

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