Designation:E2611−09StandardTestMethodforMeasurementofNormalIncidenceSoundTransmissionofAcousticalMaterialsBasedontheTransferMatrixMethod1ThisstandardisissuedunderthefixeddesignationE2611;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheuseofatube,fourmicrophones,andadigitalfrequencyanalysissystemforthemeasurementofnormalincidenttransmissionlossandotherimportantacousticpropertiesofmaterialsbydeterminationoftheacoustictransfermatrix.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C634TerminologyRelatingtoBuildingandEnvironmentalAcousticsE90TestMethodforLaboratoryMeasurementofAirborneSoundTransmissionLossofBuildingPartitionsandElementsE1050TestMethodforImpedanceandAbsorptionofAcousticalMaterialsUsingaTube,TwoMicrophonesandaDigitalFrequencyAnalysisSystem2.2ISOStandards:ISO140-3Acoustics—MeasurementofSoundInsulationinBuildingsandofBuildingElements—Part3:LaboratoryMeasurementofAirborneSoundInsulationofBuildingElements33.Terminology3.1Definitions—TheacousticalterminologyusedinthistestmethodisintendedtobeconsistentwiththedefinitionsinTerminologyC634.3.1.1referenceplane—anarbitrarysection,perpendiculartothelongitudinalaxisofthetubethatisusedfortheoriginoflineardimensions.Oftenitistheupstream(closesttothesoundsource)faceofthespecimenbut,whenspecimensurfacesareirregular,itmaybeanyconvenientplanenearthespecimen.3.1.2soundtransmissioncoeffıcient,τ—(dimensionless)ofamaterialinaspecifiedfrequencyband,t...
