Rectangular: L × W × H ÷ 1728 (cubic feet)  |  Wedge: L × W × ((H1+H2) ÷ 2) ÷ 1728
Driver displacement: typically 0.05–0.20 ft³ depending on size. Check manufacturer displacement spec if available.
Port tube volume: π × (d/2)² × length ÷ 1728 (auto-calculated when using round port inputs below).
Subtract all displacements from gross volume to get net airspace for T/S parameter matching.