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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

Applications Of Circuit Analysis

Subwoofer Enclosure

Modeling, Design, & Trends

Erich Velandia

what s a subwoofer
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
Modeling

Mass & Spring

LRC Circuits

Subwoofer Enclosures

Sealed

Ported

Bandpass

Design Tradeoffs

Compactness

Efficiency

Bass Extension

Simplicity

Low Cost

Trends

Past

Present

Outline
sealed
K

x(t)

f(t)

M

fv

Sealed
sealed 2nd order system7
Sealed (2nd Order System)

Diff. Eq

Laplace

Transfer Function

s = jw

sealed 2nd order system8
Sealed (2nd Order System)

L

R

K

x(t)

f(t)

M

C

v(t)

q(t)

fv

sealed 2nd order system9
Sealed (2nd Order System)

Mechanical

M, fv, K

x, v, f

Electrical

L, R, 1/C

Q, I, V

tradeoffs in subwoofer design
Tradeoffs In Subwoofer Design

Compactness

Simplicity

Bass

Extension

Low Cost

Efficiency

enclosure comparison
Enclosure Comparison

Driver Specifications

enclosure comparison18
Enclosure Comparison

Enclosure Size

enclosure comparison19
Enclosure Comparison

Enclosure Performance

trends in subwoofer design
Trends In Subwoofer Design
  • Consumer Demands
    • Compactness
    • Performance
      • Acoustic Power
      • Low Frequency Extension
    • Low Cost
  • Industry Concerns
    • Complexity
    • Cost
past trends
Past Trends

Sub/Sat Systems

Bose Acoustimass 5 Series III

past trends22
Past Trends

Bandpass Enclosures

Polk PSW300

past trends23
Past Trends

Isobaric to “Solobaric” Drivers

Isobaric Enclosure

Kicker S12D4

present trends
Present Trends

Driver Design

Aura 1808

Polk dB10

present trends25
Present Trends

Subwoofer Design & Performance

Sunfire MKII

JBL HPS-1000

present trends27
Car Stereo

Home Stereo

Movies & Cinema

Home Theater

Sound Reinforcement

Present Trends

Subwoofer Applications

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