Thisreferstowhetherthespeakersupportsmulti-channelsimultaneousinput,whetherthereisanoutputinterfaceforpassivesurroundspeakers,whetherthereisaUSBinputfunction,etc.Thenumberofexternalsurroundspeakersthatasubwoofercanconnecttoisalsooneofthecriteriaformeasuringexpansionperformance.TheinterfacesofordinarymultimediaspeakersmainlyincludeanaloginterfacesandUSBinterfaces.Otherssuchasopticalfiberinterfacesandinnovativededicateddigitalinterfacesarenotverycommon,sowewillnotintroducethem.
Thisisabroadconceptthathasapplicationsinmanyfields.
Inthefieldofsoftwareengineering:
Well-designedcodeallowsmorefunctionstobeinsertedintheappropriatepositionswhennecessary.Thepurposeofthisistocopewithfuturemodificationsthatmayneedtobemade,resultinginover-engineereddevelopmentofthecode.
Scalabilitycanbeachievedthroughasoftwareframework:dynamicallyloadedplug-ins,carefullydesignedclasshierarchieswithabstractinterfacesatthetop,usefulcallbackfunctionconstruction,andverylogicalandmalleablecodestructure.
Scalabilityisoneoftheprinciplesofsoftwaredesign.Itconsidersthefuturegrowthofsoftwarebyaddingnewfunctionsormodifyingexistingfunctions.Scalabilityistheabilityofsoftwaretoexpandthesystem.
Simplyput,scalabilityisabouthowtohandlelarger-scalebusinesses.Forexample,awebapplicationallowsmorepeopletouseyourservice.Ifyoucan'tfigureouthowtoimproveperformancewhilescalingout,itdoesn'tmatter.Aslongasyoucanhandlelarger-scaleusers,thereisnoproblemeveniftherearemultiplesinglepointsoffailure.Thescalabilityrequirementsofthecombinationmustmeetthecontinuousdevelopmentrequirementsofusers,aswellastheexpansionandupgraderequirementsthatareachievedduetotheneedsoftechnologicaldevelopment.