Subwoofer Box Calculator
SUBWOOFER BOX CALCULATOR
Find your optimal enclosure
HOW IT WORKS
- Select Your Driver Pick a subwoofer from our database or enter your own Thiele-Small parameters.
- Choose Enclosure Type Compare sealed and ported (vented) box designs side by side.
- Tune & See Results Adjust box volume, power, and port tuning. See SPL frequency response update in real time.
FEATURES
- Sealed & ported enclosure modeling
- Real-time SPL frequency response graph (10β500 Hz)
- Xmax excursion limit visualization
- Port dimension calculator β round, slot, and aeroport
- Port air velocity warnings
- Power handling limit warnings
- Imperial & metric unit toggle
- Free, no signup, no install β runs in your browser
What Is a Subwoofer Box Calculator?
A subwoofer enclosure calculator uses Thiele-Small parameters β Fs, Qts, Vas, Xmax and others β to predict how a driver will perform in a given box. The enclosure type and dimensions dramatically affect bass response. The same subwoofer can sound boomy, tight, or flat depending on the box.
This tool models both sealed (acoustic suspension) and ported (bass reflex) enclosures. Sealed boxes offer smooth, predictable roll-off. Ported boxes extend bass response lower but require careful port tuning to avoid noise and cone unloading.
Whether you're building a car audio subwoofer box, a home theater sealed sub, or a DIY speaker project β this calculator helps you find the right box volume and tuning before you cut wood.