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Applications Of Circuit Analysis

Applications Of Circuit Analysis. Subwoofer Enclosure Modeling, Design, & Trends. Erich Velandia. What’s A Subwoofer?. Low Frequency Speaker 20Hz - 100Hz Large Diameter 10”-18” diameter Long Throw 1”-2” Linear Excursion Enclosed Sealed Ported Bandpass. MTX T71012. Modeling

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Applications Of Circuit Analysis

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  1. Applications Of Circuit Analysis Subwoofer Enclosure Modeling, Design, & Trends Erich Velandia

  2. What’s A Subwoofer? • Low Frequency Speaker • 20Hz - 100Hz • Large Diameter • 10”-18” diameter • Long Throw • 1”-2” Linear Excursion • Enclosed • Sealed • Ported • Bandpass MTX T71012

  3. Modeling Mass & Spring LRC Circuits Subwoofer Enclosures Sealed Ported Bandpass Design Tradeoffs Compactness Efficiency Bass Extension Simplicity Low Cost Trends Past Present Outline

  4. K x(t) f(t) M fv Sealed

  5. K x(t) f(t) M fv Sealed (2nd Order System)

  6. Sealed (2nd Order System)

  7. Sealed (2nd Order System) Diff. Eq Laplace Transfer Function s = jw

  8. Sealed (2nd Order System) L R K x(t) f(t) M C v(t) q(t) fv

  9. Sealed (2nd Order System) Mechanical M, fv, K x, v, f Electrical L, R, 1/C Q, I, V

  10. Sealed Frequency Response

  11. Ported

  12. Ported Frequency Response

  13. Bandpass

  14. Bandpass Response

  15. Questions?

  16. Tradeoffs In Subwoofer Design Compactness Simplicity Bass Extension Low Cost Efficiency

  17. Enclosure Comparison Driver Specifications

  18. Enclosure Comparison Enclosure Size

  19. Enclosure Comparison Enclosure Performance

  20. Trends In Subwoofer Design • Consumer Demands • Compactness • Performance • Acoustic Power • Low Frequency Extension • Low Cost • Industry Concerns • Complexity • Cost

  21. Past Trends Sub/Sat Systems Bose Acoustimass 5 Series III

  22. Past Trends Bandpass Enclosures Polk PSW300

  23. Past Trends Isobaric to “Solobaric” Drivers Isobaric Enclosure Kicker S12D4

  24. Present Trends Driver Design Aura 1808 Polk dB10

  25. Present Trends Subwoofer Design & Performance Sunfire MKII JBL HPS-1000

  26. Passive Radiator

  27. Car Stereo Home Stereo Movies & Cinema Home Theater Sound Reinforcement Present Trends Subwoofer Applications

  28. Questions?

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