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1、SpeakerPowerRequirementsAnswersToSomeOftenAskedQuestions1.Whatdotermslike“peak,”“instantaneousFigure1.PeakandAveragePowerRequirementspower,”“musicpower,”and“programpower”mean?Basically,thesetermsdescribe,inonewayoranother,thetime-varyingnatureofmusicandtheelectricalpowerr
2、equiredtoreproduceit.A150-wattlightbulbpresentsaconstant150-wattloadtoanelectricalpowersourcewhenitison.Bycontrast,a150-wattaudioamplifierwillonlyrarelybecalledupontodeliveritsfulloutputtoaloudspeaker.Figure1illustratesthetime-varyingnatureofmusicandthepowerwhichmayberequ
3、iredtoreproduceitIntheillustration,thetermpeakpowerisclearlydefinedasthemaximumpowerrequiredoverthetimeAllloudspeakersarecapableofsustainingshortintervalshown.Averagepowerrepresentstheoverallpeaksofpowermuchhigherthantheycansustainonaaveragepowerrequirementforthetimeinter
4、valinsteady,continuousbasis,andtheproperchoiceofquestion.amplifierisquitedependentontheloudspeaker'sabilitytodothis.Therearetwopointstobenotedhere:bothpeakandaveragepowerrequirementsarevery2.Howdoesthenatureofprogrammaterialdependentonthenatureoftheprogramsignal,andtheaff
5、ectaloudspeaker'spowerhandlingpeak-to-averageratiocanvaryconsiderablyfromonecapability?kindofprogramtoanother.Loudspeakerscansustaintwokindsofdamage,Strictlyspeaking,theterminstantaneouspowerthermalandmechanical.Letusassumethata100-wattreferstoanyveryshort-termpowerrequir
6、ement,andamplifierbecomesdefectiveandgoesintooscillationatnormallyitisassociatedwiththemaximumpowerwhichsomehighfrequencyoutsidetherangeofnormaltheprogramsignalmayrequire.Suchtermsasmusichearing.Inshortorder,thelighttweetervoicecoilmaypowerandprogrampowerarenotrigorouslyd
7、efined,beburntoutthroughoverheating.Ontheotherhand,butmaybethoughtofessentiallyasvariationsofsup-posethatawooferisrepeatedlystressedbyaveragepower.excessiveexcursionsduetoturntablerumble,excessivebassboost,low-frequencyfeedback,oranycombinationInthefigure,theprogramenvelo
8、peisplottedofthese.Afterawhile,themovingpartsofthewooferagainsttimealongthehorizontalaxisforatyp
