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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 l.jpg

Applications Of Circuit Analysis

Subwoofer Enclosure

Modeling, Design, & Trends

Erich Velandia


What s a subwoofer l.jpg
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


Outline l.jpg

Modeling

Mass & Spring

LRC Circuits

Subwoofer Enclosures

Sealed

Ported

Bandpass

Design Tradeoffs

Compactness

Efficiency

Bass Extension

Simplicity

Low Cost

Trends

Past

Present

Outline


Sealed l.jpg

K

x(t)

f(t)

M

fv

Sealed


Sealed 2nd order system l.jpg

K

x(t)

f(t)

M

fv

Sealed (2nd Order System)



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Sealed (2nd Order System)

Diff. Eq

Laplace

Transfer Function

s = jw


Sealed 2nd order system8 l.jpg
Sealed (2nd Order System)

L

R

K

x(t)

f(t)

M

C

v(t)

q(t)

fv


Sealed 2nd order system9 l.jpg
Sealed (2nd Order System)

Mechanical

M, fv, K

x, v, f

Electrical

L, R, 1/C

Q, I, V








Tradeoffs in subwoofer design l.jpg
Tradeoffs In Subwoofer Design

Compactness

Simplicity

Bass

Extension

Low Cost

Efficiency


Enclosure comparison l.jpg
Enclosure Comparison

Driver Specifications


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Enclosure Comparison

Enclosure Size


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Enclosure Comparison

Enclosure Performance


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Trends In Subwoofer Design

  • Consumer Demands

    • Compactness

    • Performance

      • Acoustic Power

      • Low Frequency Extension

    • Low Cost

  • Industry Concerns

    • Complexity

    • Cost


Past trends l.jpg
Past Trends

Sub/Sat Systems

Bose Acoustimass 5 Series III


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Past Trends

Bandpass Enclosures

Polk PSW300


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Past Trends

Isobaric to “Solobaric” Drivers

Isobaric Enclosure

Kicker S12D4


Present trends l.jpg
Present Trends

Driver Design

Aura 1808

Polk dB10


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Present Trends

Subwoofer Design & Performance

Sunfire MKII

JBL HPS-1000



Present trends27 l.jpg

Car Stereo

Home Stereo

Movies & Cinema

Home Theater

Sound Reinforcement

Present Trends

Subwoofer Applications



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