Slot Port Box Calc
DIY Slot-Port Enclosure Calculator
Enclosure Dimensions
Thickness of the enclosure walls; subtracted twice from each dimension.
Internal Adjustments
When “Sub Up” is selected, the internal height shrinks by 0.75″; when “Sub Back” is selected, the internal depth shrinks by 0.75″.
Additional internal partitions that may affect internal volume.
Number of shared walls between the port and the box. More common walls (up to 3) extend the effective port length slightly, lowering the tuning frequency.
Internal bracing volume (if applicable) in cubic feet.
Subwoofer Info
Thickness of the panel where the woofer is mounted (affects cutout volume).
Volume taken up by the woofer itself (manufacturer data).
Enter the diameter of the woofer cutout. The resulting cutout volume is added back to the enclosure.
Port & Tuning Details
The inner width of the port opening.
The inner height of the port opening.
Length of the port tube.
Thickness of the material forming the port walls.
Results
Volume (in³): TBD
Volume (ft³): TBD
Tuning Frequency: TBD Hz
More info
Calculated using Fb = 0.159 × √((Av × 1.84e8) / (Vb × 1728 × (L_eff + 0.823√Av))),
where L_eff is the effective port length extended by common walls.
Net Airspace: TBD cu ft
Port Per Cube: TBD
ft³ per sub: TBD
Cut Sheet
Top: TBD
Bottom: TBD
Front: TBD
Back: TBD
Sides: TBD