Subwoofer Box Design: Online software to calculate your bass box (sealed, vented or bandpass)

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Enter your subwoofer's data (called Thiele-Small parameters) in the various input boxes. This data should be available from the manufacturer of the woofer, or you may be able to find it online. The box parameters and graphs will update as you alter the input data. Hover your mouse cursor over the input boxes and along the graph lines to see helpful pop-up notes and detailed information. Note: the Adobe Flash web browser plugin is needed to see the bass box calculator.

We have compared this calculator with results calculated by our reference PC-based software. While there are differences, this AJ Design software seems reliable. When compared with results from our reference, this one seems to generally calculate the F3 to be 5 to 10Hz lower. Fb appears to correlate quite closely.

We offer this online calculator freely for your use but we cannot accept responsibility for inaccurate calculations and would always recommend you visit a professional installer for best results. We also offer a Pro Bass Box Design service at low cost - we use our more advanced software to create a complete set of build drawings. Click on the link to find out more.

By AJ Design Software


We offer a low cost bass box design service. Tell us your subwoofer model and we will provide the optimum enclosure size, port dimensions (where applicable), estimated in-car frequency response (in typical saloon car), estimated cone movement with 150W (or your preferred power figure) and a complete set of drawings to allow you (or your installer) to construct the box. These are emailed to you as a PDF file.
See the Pro Bass Design Service page for details.

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