Subwoofer Enclosure Calculator
Calculate box volume and port dimensions for sealed or ported subwoofer enclosures.
Inputs
in
gal
Hz
Results
Box Volume
19.2 L
≈ 5 milk jugs
Box Volume0.68 ft³
Port Tuning Freq25 Hz
Port Length0 in
Est. F3 (-3dB point)22 Hz
How to Use This Calculator
- Enter Driver Diameter, Vas (Compliance Volume), and Qts (Total Q).
- Set Fs (Resonant Frequency) and Type (0=Sealed, 1=Ported).
- Review the Box Volume (L) result.
- Use Box Volume (ft³) and Port Tuning Freq (Hz) to inform your decision.
How the result changes with Qts (Total Q)
| Qts (Total Q) | Box Volume |
|---|---|
| 0.29 | 10.1 L |
| 0.77 | 70.2 L |
| 1.33 | 212.3 L |
| 1.81 | 393.1 L |
What each input means
- Driver Diameter
- Subwoofer driver diameter in inches.
- Vas (Compliance Volume)
- Driver's equivalent compliance volume from the spec sheet.
- Qts (Total Q)
- Total Q factor of the driver (from spec sheet).
- Fs (Resonant Frequency)
- Free-air resonant frequency of the driver.
- Type (0=Sealed, 1=Ported)
- 0 for sealed (tight bass), 1 for ported (louder, deeper).
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersDriver Diameter = 12, Vas (Compliance Volume) = 80, Qts (Total Q) = 0.4, Fs (Resonant Frequency) = 28 = 5 input(s) provided
- Calculate Box Volume19.2 = 19.2
- Calculate Box VolumeBox Volume0.68 = 0.68
- Calculate Port Tuning FreqPort Tuning Freq25 = 25
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