An Experimental An Experimental Evaluation Evaluation of Regular Polyhedron of Regular Polyhedron Loudspeakers Loudspeakers as Omnidirectional as Omnidirectional Sources of Sound Sources of Sound Sarah Rollins Sarah Rollins Timothy W. Leishman Timothy W. Leishman Acoustics Research Group Acoustics Research Group Department of Physics and Astronomy Department of Physics and Astronomy Brigham Young University Brigham Young University November 11, 2003 November 11, 2003
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An Experimental Evaluation of Regular Polyhedron Loudspeakers as Omnidirectional Sources of Sound Sarah Rollins Timothy W. Leishman Acoustics Research.
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An Experimental An Experimental Evaluation Evaluation
of Regular Polyhedron of Regular Polyhedron LoudspeakersLoudspeakers
as Omnidirectional as Omnidirectional Sources of SoundSources of Sound
Sarah RollinsSarah RollinsTimothy W. LeishmanTimothy W. Leishman
Acoustics Research GroupAcoustics Research GroupDepartment of Physics and AstronomyDepartment of Physics and Astronomy
Brigham Young UniversityBrigham Young UniversityNovember 11, 2003November 11, 2003
• Regular Polyhedron Loudspeakers (RPLs)Regular Polyhedron Loudspeakers (RPLs)• What about other RPLs besides the dodecahedron?What about other RPLs besides the dodecahedron?
EM DodecahedronEM Dodecahedron 1.611.61 *2.19*2.19
EV DodecahedronEV Dodecahedron 1.991.99 2.322.32
IcosahedronIcosahedron 2.122.12 2.462.46
AverageAverage 1.921.92 2.372.37
* Indicates the lowest value for the given frequency range
ConclusionsConclusions
• Best omnidirectional Best omnidirectional source source • Depends on bandwidthDepends on bandwidth
• TetrahedronTetrahedron• 0-4 kHz octave band0-4 kHz octave band• Contradicts ISO 3382Contradicts ISO 3382
• Dodecahedron Dodecahedron • 0-8 kHz octave band0-8 kHz octave band• More power outputMore power output
Further ResearchFurther Research
• Higher resolution measurements Higher resolution measurements • High frequency informationHigh frequency information
• Impulse response measurementsImpulse response measurements• Compare measurements for different RPLs Compare measurements for different RPLs
and different orientationsand different orientations• Further comparison of standard Further comparison of standard
deviation with current methods to deviation with current methods to quantify omnidirectivityquantify omnidirectivity
• Analytical and numerical calculationsAnalytical and numerical calculations• Different size RPLsDifferent size RPLs
AcknowledgmentsAcknowledgments
• Funding: NSF REU programFunding: NSF REU program• Advisor: Dr. Timothy W. LeishmanAdvisor: Dr. Timothy W. Leishman• Gordon DixGordon Dix• Kent GeeKent Gee• Todd KitchenTodd Kitchen• Wesley LifferthWesley Lifferth• Jacob RobinsonJacob Robinson