According how audio industry seems to use the

According how audio industry seems to use the term PMPO ("Peak Music Power Output" or "Peak Momentary Power Output"), in can be anythign from 5 to 10 watts of PMPO that equals one real RMS watt.

I believe the term refers to "PuMPed Output watts.
To measure this, the output of the amplifier is connected via a voltage multiplier to a capacitor
which is allowed to charge. A load is then connected to the capacitor and the instantaneous power measured. This is PMPO watts.

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