Subwoofer Vent Equations Calculator
Home Theater Systems Car Audio Formulas
Subwoofer Box Comparison Calculator:
Compare bandpass, sealed and vented frequency output graphs for a subwoofer in one program.
Solving for minimum port or vent diameter for a vented box or enclosure.
Inputs:
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Conversions:
driver effective diameter (D)
= 0
= 0
centimeter
linear displacement maximum (Xmax)
= 0
= 0
millimeter
box ore enclosure frequency(fb)
= 0
= 0
hertz
number of ports (Np)
= 0
= 0
Solution:
minimum port or vent diamter (Dmin)
= NOT CALCULATED
Other Units:
Change Equation
Select to solve for a different unknown
Select to solve for a different unknown
Subwoofer Box and Speaker Enclosure
 | vent or port length |
 | minimum vent or port diameter |
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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