American Bass Audio
Box & Port Calculator
Calculate enclosure volume and port length for your subwoofer build
Enter Dimensions: You know your box size or have space constraints. Enter width, height, and depth to calculate volume and port length.
Net Volume
0.00ft³
After all displacement
Port Length
0.0in
For 32 Hz tuning
Port Area: Good
Velocity: Quiet
Fit: Port fits inside box
Enclosure Dimensions
External measurements in inches
Width
The longest external dimension of your box, typically runs left-to-right when facing the enclosure.
in
Height
Vertical measurement of the box. Consider your vehicle's available space when setting this.
in
Depth
Front-to-back measurement. Must be deep enough to fit your subwoofer's mounting depth plus clearance.
in
Wood Thickness
Standard MDF is 3/4" (19mm). Use 1" (25mm) for larger enclosures. Thicker material = stronger box but less internal volume.
in
💪 Bracing Recommended
For enclosures over 3 ft³, add internal bracing to prevent panel flex. Use 2-3 braces made from the same material. This adds approximately 0.02-0.05 ft³ of displacement.
Target Volume Mode
Enter your desired net volume, get suggested dimensions
ft³
in
in
💡 Suggested Dimensions
32" × 14" × 16"
Subwoofer
Select size or enter custom displacement
Subwoofer Size
Select your subwoofer size to auto-fill typical displacement. For exact values, check your subwoofer's specifications sheet.
Displacement
The volume the subwoofer's motor and cone take up inside the box. Found in your sub's spec sheet as "Vd" or "displacement volume."
ft³
1
Enclosure Type
Choose sealed or ported design
🔒 Sealed
Tight, accurate bass
🔊 Ported
Louder, deeper bass
💡 Sealed Box Tips
Sealed enclosures provide tight, accurate bass with excellent transient response. Consider adding polyfill (1-1.5 lbs per ft³) to make the box appear acoustically larger and smooth the response. Sealed boxes are more forgiving of volume variations than ported designs.
Daily
35 Hz
Balanced
32 Hz
SPL / Low
28 Hz
Port Type
Slot Port: Rectangular opening, often built into box wall. More area in less space.Round/Aero: Circular tube port. Easier to build but may need more length.
Tuning Frequency
Higher (35+ Hz): Punchier, tighter bass. Good for daily listening and rock/pop.Lower (28-32 Hz): Deeper, more extended bass. Better for hip-hop, EDM, and SPL competitions.
Hz
Port Width
The narrow dimension of your slot port. Typical range: 2-4 inches. Wider = more port area but longer port length needed.
in
Port Height
The tall dimension of your slot port. Often matches (or is slightly less than) your box's internal height.
in
1
Port Velocity: ~15 m/s
Quiet operation - no port noise expected
Calculation Results
All measurements for your build
Gross Volume
0.00 ft³
Sub Displacement
0.00 ft³
Port Displacement
0.00 ft³
Port Area
0.0 sq in
📋 Build Sheet
Enclosure Type
Ported
External Dimensions
32" × 14" × 16"
Internal Dimensions
30.5" × 12.5" × 14.5"
Net Volume
0.00 ft³
Tuning Frequency
32 Hz
Port Dimensions
3" × 12"
Port Length
0.0"
✂️ Cut List
All pieces needed to build your enclosure
Enclosure Panels
Port Pieces
AMERICAN BASS AUDIO
Subwoofer Enclosure Build Sheet
Enclosure Specifications
Enclosure Type:
External Dimensions:
Internal Dimensions:
Wood Thickness:
Gross Volume:
Net Volume:
Subwoofers:
Port Specifications
Tuning Frequency:
Port Type:
Port Dimensions:
Port Length:
Port Area:
Number of Ports:
Cut List
Disclaimer: This calculator provides estimates for educational purposes only. Always verify calculations independently before building. Results may vary based on construction methods, materials, and environmental factors. American Bass Audio is not responsible for enclosures built using these calculations. Measure twice, cut once!