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″.
Reserved for future use: this field is currently informational only and does not affect volume calculations yet.
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. This is subtracted from net airspace.
Subwoofer Info
Thickness of the panel where the woofer is mounted (affects cutout volume).
Volume taken up by the woofer itself (manufacturer data). If left blank, typical displacement may be auto-filled based on woofer size.
Enter the diameter of the woofer cutout. If left blank, a typical cutout may be auto-filled based on woofer size. 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.
Physical length of the port from inside the box to the opening.
Reserved for future use: this value is currently informational only and does not modify port calculations yet.
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 Av is port cross-sectional area (in²), Vb is net box volume (ft³),
and 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