Subwoofer Box Volume Calculator

Calculate the optimal sealed or ported enclosure volume for your subwoofer driver.

Driver Size (inches)

Enclosure Type

Number of Drivers

Vas (Equivalent Volume, liters)

Formula

Sealed Volume = Vas x 0.7 per driver; Ported Volume = Vas x 1.5 per driver

Is a sealed or ported subwoofer box better?

Sealed boxes produce tighter, more accurate bass while ported boxes are louder and more efficient but less precise.

Does box volume affect bass quality?

Yes, too small a box makes bass sound thin and boomy, while too large a box reduces output and control.

What size box do I need for a 12-inch sub?

A 12-inch subwoofer typically needs 1.0-1.5 cubic feet sealed or 2.0-3.0 cubic feet ported.

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