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Audio power
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=== PMPO === ''PMPO'', which stands for ''Peak Music Power Output''<ref>{{Cite book|url=https://archive.org/details/wordsworthdictio0000dale|url-access=registration|title=The Wordsworth Dictionary of Abbreviations and Acronyms|last1=Dale|first1=Rodney|last2=Puttick|first2=Steve|date=1997-01-01|publisher=Wordsworth Editions|isbn=9781853263859|page=[https://archive.org/details/wordsworthdictio0000dale/page/127 127]|language=en|quote=PMPO peak music power output}}</ref><ref>{{Cite book|url=https://books.google.com/books?id=d4iuIdjZBBMC&q=%22peak+music+power+output%22&pg=PA246|title=Dictionary of technical abbreviations: SPAIN - German|last=Huzau|first=Alexander C.|date=2000-01-01|publisher=BoD β Books on Demand|isbn=9783831112999|page=246|quote=PMPO acoustic. peak music power output}}</ref> or ''Peak momentary performance output'',<ref>{{cite web|url=http://www.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=slea047a|title=Power Rating in Audio Amplifier (Rev. A), slea047a - TI.com|website=www.ti.com|access-date=2016-11-04}}</ref> is a much more dubious [[figure of merit]], of interest more to advertising copy-writers than to consumers.<ref>{{cite web|url=https://www.audioholics.com/audio-amplifier/amplifier-power-ratings|title=The Truth About Amplifier Power Ratings|website=Audioholics Home Theater, HDTV, Receivers, Speakers, Blu-ray Reviews and News|date=27 April 2009 |access-date=2016-04-22}}</ref> The term PMPO has never been defined in any standard,<ref>{{Cite magazine|url=https://books.google.com/books?id=WwsEAAAAMBAJ&q=%22peak+music+power+output%22&pg=PA33|title=Silly Season On in Phono Field|last=Lachenbruch|first=David|magazine=Billboard|date=1963-07-20|publisher=Nielsen Business Media, Inc.|page=33|language=en|issn=0006-2510|quote=It was called "Music Power Output." So now that we have a good, workable standard, what do we see in the industry's advertising material? Something brand new. It's called β of all things β "Peak Music Power Output".}}</ref> but it is often taken to be the sum of some sort of peak power for each amplifier in a system. Different manufacturers use different definitions, so that the ratio of PMPO to continuous power output varies widely; it is not possible to convert from one to the other. Most amplifiers can sustain their PMPO for only a very short time, if at all; loudspeakers are not designed to withstand their stated PMPO for anything but a momentary peak without serious damage.
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