AJ Subwoofer Vent Equations and Formulas Calculator
Home Theater Sound Systems - Car Audio
Solving for minimum port or vent diameter for a vented box or enclosure.
Inputs:
Conversions:
| D | = | 0 | | = | 0 | centimeter |
| Xmax | = | 0 | | = | 0 | millimeter |
| Fb | = | 0 | | = | 0 | hertz |
| Np | = | 0 | | = | 0 | |
Solution:
| minimum port or vent diamter (Dmin) | = | HAS NOT BEEN CALCULATED | |
Other Units:
Change Equation
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
