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Box Calculator

EBP under 50: Leans toward sealed
EBP over 100: Leans toward ported
Qtc 0.707: Textbook flat response (Butterworth)
F3: Where output drops 3dB from reference

Design sealed and ported enclosures using Thiele-Small parameters. Select a driver from our database or enter specs manually.

Driver Selection

Search our database of subwoofers with T/S parameters

Number of Subwoofers

Calculate both sealed and ported options to see which enclosure type is recommended for this driver based on its EBP (Efficiency Bandwidth Product).

Search for your subwoofer or enter T/S specs manually

Choose enclosure type (Sealed, Ported, or Compare)

Click Calculate to see results