Sealed or Ported Enclosure Calculator Help
Use the Sealed vs. Ported Calculator.
This simple calculator will tell you if your driver is better suited for a sealed or a ported speaker box enclosure. This is the formula that is used:
Efficiency Bandwidth Product (EBP) = Free Air Resonance (Fs) / Driver Electrical "Q" (Qes)
The Efficiency Bandwidth Product (EBP) is used to determine the best type of enclosure for your driver as shown below:
|less than 50||Sealed|
|50 to 90||Either|
|more than 90||Ported|
This calculator is a rough approximation. A EBP of 91 doesn't mean you cannot used a Sealed Enclosure. Some people feel that an EBP of 50-100 (not 90) will work for either type of enclosure.
As always, review the manufacturer recommendations first since they know best. Also don't ignore common sense. If a ported enclosure calls for a port that is longer than the box itself, then the ported enclosure will not work.