Free Software

When designing the working volume and tuning frequency for your subwoofer, it's hard to go past WinISD, linked to at the bottom of the list.
The rest of the software here does the stuff that WinISD doesn't cover, such as helping you work out your enclosure dimensions, choose the correct size for your ports, and design a high-pass filter.
Most recently added is QRDude, a package for designing QRD diffusers, along with a comprehensive Technical Reference, detailed User Guide and Sample Build page.

Sample code



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