Subwoofer Box Calculator

Calculate subwoofer enclosure dimensions and internal volume for sealed and ported designs with external dimension output.

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Subwoofer box dimensions use the golden ratio (1.618) to minimize standing waves inside the enclosure. Gross volume must account for bracing, driver magnet displacement, and port tube volume (typically 5-15% of net volume). Use 19mm (3/4") MDF or plywood minimum; 25mm for boxes over 60L. All joints should be glued and screwed. Internal bracing (shelf or window brace) is essential for boxes over 30L to prevent panel resonance. Round internal edges with filler to reduce turbulence.