4th Order Bandpass 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 tuning frequency.
note:
| for S=0.7 | use | b=0.7206 |
| for S=0.6 | use | b=0.9560 |
| for S=0.5 | use | b=1.2712 |
Inputs:
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Conversions:
maximum air volume displaced by cone excursion (Vd)
= 0
= 0
meter^3
minimum vent port diameter (Dmin)
= 0
= 0
centimeter
number of ports or vents (Np)
= 0
= 0
Solution:
tuning frequency (fb) = NOT CALCULATED
Other Units:
Change Equation
Select to solve for a different unknown
low frequency f3 rolloff
high frequency f3 rolloff
front chamber port tuning frequency
ported front chamber net volume
sealed rear chamber net volume
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
Fourth Order Bandpass
sealed rear chamber Q | sealed rear chamber Q |
 | passband ripple |
 | sensitivity gain |
low frequency f3 rolloff
 | low frequency f3 rolloff |
 | speaker resonance frequency |
 | speaker total Q |
high frequency f3 rolloff
 | high frequency f3 rolloff |
 | low frequency f3 rolloff |
 | speaker resonance frequency |
 | speaker total Q |
front chamber port tuning frequency
 | front chamber port tuning frequency |
 | sealed rear chamber Q |
 | speaker resonance frequency |
 | speaker total Q |
ported front chamber net volume
 | ported front chamber net volume |
 | overall bandwidth |
 | speaker total Q |
 | equivalent air compliance |
sealed rear chamber net volume
 | sealed rear chamber net volume |
 | equivalent air compliance |
 | sealed rear chamber Q |
 | speaker total Q |
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. https://www.diysubwoofers.org.
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