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AJ Subwoofer Vent Equations and Formulas Calculator
Home Theater Sound Systems - Car Audio
Subwoofer
Box Comparison Calculator:
Compare bandpass, sealed and vented frequency
output graphs
for a subwoofer in one program.
Solving For Length of Vent or Port
Inputs:
Conversions:
| diameter of vent (Dv) | = | 0 | = | 0 | centimeter | |
| number of ports (Np) | = | 0 | = | 0 | ||
| volume of box (Vb) | = | 0 | = | 0 | liter | |
| frequency of box (fb) | = | 0 | = | 0 | hertz | |
| end correction factor (k) | = | 0 | = | 0 |
Solution:
| vent length (Lv) | = | HAS NOT BEEN CALCULATED |
Other Units:
Select an equation to solve for a different unknown
Subwoofer Box and Speaker Enclosure
 |
vent or port length |
 |
minimum vent or port diameter |
Note
k values:
| vent has one free end and one flanged | = | 0.732 |
| vent has two free ends | = | 0.614 |
| vent has two flanged ends | = | 0.850 |
Where
| Lv | = | length of port or vent |
| Dv | = | diameter of port or vent |
| Dmin | = | minimum diameter of port or vent |
| Np | = | number of ports or vents |
| Vb | = | volume of box |
| fb or Fb | = | tuning frequency |
| k | = | end correction factor |
| Sd | = | surface area of subwoofer |
| Vd | = | driver displacement volume |
| Xmax | = | maximum linear displacement of driver |
References - Books:
See 6 on reference page
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