300 likes | 869 Views
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
E N D
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 Mass & Spring LRC Circuits Subwoofer Enclosures Sealed Ported Bandpass Design Tradeoffs Compactness Efficiency Bass Extension Simplicity Low Cost Trends Past Present Outline
K x(t) f(t) M fv Sealed
K x(t) f(t) M fv Sealed (2nd Order System)
Sealed (2nd Order System) Diff. Eq Laplace Transfer Function s = jw
Sealed (2nd Order System) L R K x(t) f(t) M C v(t) q(t) fv
Sealed (2nd Order System) Mechanical M, fv, K x, v, f Electrical L, R, 1/C Q, I, V
Tradeoffs In Subwoofer Design Compactness Simplicity Bass Extension Low Cost Efficiency
Enclosure Comparison Driver Specifications
Enclosure Comparison Enclosure Size
Enclosure Comparison Enclosure Performance
Trends In Subwoofer Design • Consumer Demands • Compactness • Performance • Acoustic Power • Low Frequency Extension • Low Cost • Industry Concerns • Complexity • Cost
Past Trends Sub/Sat Systems Bose Acoustimass 5 Series III
Past Trends Bandpass Enclosures Polk PSW300
Past Trends Isobaric to “Solobaric” Drivers Isobaric Enclosure Kicker S12D4
Present Trends Driver Design Aura 1808 Polk dB10
Present Trends Subwoofer Design & Performance Sunfire MKII JBL HPS-1000
Car Stereo Home Stereo Movies & Cinema Home Theater Sound Reinforcement Present Trends Subwoofer Applications