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 minimum port vent diameter.
Inputs:
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Conversions:
maximum air volume displaced by cone excursion (Vd)
= 0
= 0
meter^3
tuning frequency (fb)
= 0
= 0
hertz
number of ports or vents (Np)
= 0
= 0
Solution:
minimum vent port diameter (Dmin) = NOT CALCULATED
Other Units:
Change Equation
Select to solve for a different unknown
box or enclosure volume
box or enclosure tuning frequency
box or enclosure tuning frequency
peak sound pressure level
sound pressure level
maximum air volume displaced by cone excursion
cone effective radiation area
port or vent length
minimum port or vent diameter
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 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
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