Looking around the internet, there haven't been many answers to this questtion. Here is one which doesn't fully explain it: Power input smaller than output? How can this be?
So I am confused. I know that a transformer (step-up or step-down) can change the voltage and amperage, but without changing the overall power output. So how is it that a speaker (eg Panasonic SC-CMAX5) have a much higher output than input? How can the energy which is put in be less than watt is put out (get it?). The SC-CMAX 5 has a nominal input ("power consumption") of 92W but an output (RMS) of 1000W.
Is it something to do with the RMS or PMPO listed on the spec sheet?