# Vented Ported Subwoofer Box Equations Formulas Design Calculator

## Low Frequency Enclosures - Car Audio - Home Theater Sound System

Subwoofer Box Comparison Calculator:
Compare bandpass, sealed and vented frequency output graphs
for a subwoofer in one program.

Solving for maximum air volume displaced by cone excursion.

Inputs:
 tuning frequency (fb) hertz1/day1/hour1/minute1/secondcycle/daycycle/hourcycle/minutecycle/secondrevolution/dayrevolution/hourrevolution/minuterevolution/secondrotation/dayrotation/hourrotation/minuterotation/secondRPM
 minimum vent port diameter (Dmin) meterangstromattometercentimeterchaindekameterdecimeterexameterfemtometerfootgigameterhectometerinchkilometerlight yearlinkmegametermicrometermicronmilemillimeternanometerparsecpetameterpicometerrodterameteryard
 number of ports or vents (Np)

#### Conversions:

 tuning frequency (fb)= 0 = 0hertz
 minimum vent port diameter (Dmin)= 0 = 0centimeter
 number of ports or vents (Np)= 0 = 0

#### Solution:

 maximum air volume displaced by cone excursion (Vd)= NOT CALCULATED

#### Other Units:

Change Equation
Select to solve for a different unknown
efficiency bandwidth product
 efficiency bandwidth product speaker resonance frequency speaker electrical Q

box or enclosure volume
 box or enclosure volume speaker total Q at fs air volume with same acoustic compliance as the speaker suspension

box or enclosure tuning frequency
 box or enclosure tuning frequency air volume with same acoustic compliance as the speaker suspension box or enclosure volume speaker resonance frequency

box or enclosure tuning frequency
 minus three decibel half power frequency air volume with same acoustic compliance as the speaker suspension box or enclosure volume speaker resonance frequency

peak sound pressure level
 peak sound pressure level speaker total Q at fs equivalent air compliance box enclosure volume

sound pressure level
 sound pressure level free air reference efficiency

maximum air volume displaced by cone excursion
 maximum air volume displaced by cone excursion cone effective radiation area cone peak linear displacement

 cone effective radiation area cone diameter plus one third of surround

port or vent length
 port or vent length volume of enclosure or box tuning frequency end correction factor

minimum port or vent diameter
 minimum port or vent diameter maximum air volume displaced by cone excursion tuning frequency

References - Books:
1) Dickason, Vance. 1991. The Loudspeaker Design Cookbook. Audio Amateur Press. 4th ed.
2) Steele, Brian. 2002. The Subwoofer DIY Page v1.1. http://www.diysubwoofers.org.

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By Jimmy Raymond

Contact: aj@ajdesigner.com