Peak Music Power Output (PMPO) (also Peak momentary performance output)
The term PMPO has never been defined in any standard but it tends most often to be the peak power of every amplifier in a system added together. Peak power is twice the sine wave power, so, for example, a 5 channel system using 10 watt amplifiers might be specified as '100 watts PMPO'. Sometimes, an extra factor is applied to get an even higher figure. The term PMPO is greatly despised by audio professionals; it is considered misleading and without purpose. Most systems cannot sustain their PMPO for more than a few seconds, loudspeakers being particularly vulnerable. The voice coil might burn out, or the speaker may actually catch on fire, from the voice coil becoming hot enough to ignite the speaker cone. In other situations, the crossover in the speaker cabinet may fail, including (but not limited to) burnt-out choke coils, exploded electrolytic capacitors, burnt-out resistors, or blown fuses. There have been genuine attempts to measure 'peak music power', as described below, but in general the term is not at all useful.