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An Experimental Evaluation of Regular Polyhedron Loudspeakers as Omnidirectional Sources of Sound

An Experimental Evaluation of Regular Polyhedron Loudspeakers as Omnidirectional Sources of Sound. Sarah Rollins Timothy W. Leishman Acoustics Research Group Department of Physics and Astronomy Brigham Young University November 11, 2003. Introduction. Architectural Acoustics

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An Experimental Evaluation of Regular Polyhedron Loudspeakers as Omnidirectional Sources of Sound

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  1. An Experimental Evaluation of Regular Polyhedron Loudspeakersas Omnidirectional Sources of Sound Sarah Rollins Timothy W. Leishman Acoustics Research Group Department of Physics and Astronomy Brigham Young University November 11, 2003

  2. Introduction • Architectural Acoustics • Omnidirectional source • Dodecahedron loudspeaker • Regular Polyhedrons • Regular Polyhedron Loudspeakers (RPLs) • What about other RPLs besides the dodecahedron?

  3. Regular Polyhedron Loudspeakers • Built all 5 RPLs • 2 categories • Equal Volume per Driver (EV) • Equal Midradii (EM)

  4. Experimental Setup

  5. Current Standard

  6. Standard Deviation Formulation • Standard deviation of directivity balloon values • Advantages over current methods • Visualization • Full sphere • Disadvantages • More time consuming • More equipment

  7. Standard Deviation Plots

  8. Figure of Merit Table * Indicates the lowest value for the given frequency range

  9. Conclusions • Best omnidirectional source • Depends on bandwidth • Tetrahedron • 0-4 kHz octave band • Contradicts ISO 3382 • Dodecahedron • 0-8 kHz octave band • More power output

  10. Further Research • Higher resolution measurements • High frequency information • Impulse response measurements • Compare measurements for different RPLs and different orientations • Further comparison of standard deviation with current methods to quantify omnidirectivity • Analytical and numerical calculations • Different size RPLs

  11. Acknowledgments • Funding: NSF REU program • Advisor: Dr. Timothy W. Leishman • Gordon Dix • Kent Gee • Todd Kitchen • Wesley Lifferth • Jacob Robinson

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