Subwoofer calculators.
Choose a tool for the question you're trying to answer. Start with your driver data, work from net internal volume, and keep the assumptions in view.
Enclosure volume
From cabinet dimensions to the air your driver actually sees.
Sealed box
Balance box volume, system resonance, and low-frequency response.
Ported box
See how the driver, enclosure, and port work together.
Port length
Find a practical starting length for round or slot ports.
Port velocity
Check vent air speed at a real frequency and drive level.
Passive radiator
Calculate added mass and check radiator excursion.
Fourth-order bandpass
Model a sealed rear chamber and a ported front chamber.
Sixth-order bandpass
Compare parallel and series chamber connections.
Thiele-Small parameters
Fill the gaps in your driver data and check consistency.
Measure driver parameters
Turn an impedance measurement into a useful driver model.
Excursion & SPL
Explore the physical relationship between displacement and output.
Reference efficiency
Keep efficiency, voltage sensitivity, and power sensitivity distinct.
Piston radiation
Examine the air load on an ideal baffled circular piston.
Subwoofer wiring
Find the right coil connections and nominal amplifier load.
High-pass filter
Inspect attenuation and reduce excursion below tuning.
Group delay
Inspect timing from a sealed model or measured phase data.
Room modes
Find the resonant frequencies of a rectangular room.
Not sure which enclosure to choose?
Start with the enclosure guide