Sub Box Calculator: Global Precision for Earth-Shaking Bass
From car audio to home theater, our sub box calculator designs perfect sealed, ported, and bandpass enclosures — trusted by SPL competitors and audiophiles worldwide.
"Music is the strongest form of magic."
How the Sub Box Calculator Works
Using 2025 global audio standards, the sub box calculator computes:
- Sealed volume (Qts-based)
- Ported tuning and length
- Port area and velocity
- Displacement and bracing
- Material and cost estimate
- Bandpass and passive options
Vb = Vas × (Qts² / 0.3) for sealed
Port Length = (23562.5 × Dv²) / (Fb² × Vb) - 0.823 × √Dv
Port Length = (23562.5 × Dv²) / (Fb² × Vb) - 0.823 × √Dv
Recommended Box Volumes (2025)
| Driver | Sealed | Ported | Tuning |
|---|---|---|---|
| 10" | 0.5–0.8 cu ft | 1.0–1.5 cu ft | 35 Hz |
| 12" | 0.8–1.5 cu ft | 1.75–2.75 cu ft | 32 Hz |
| 15" | 1.5–3.0 cu ft | 3.0–5.0 cu ft | 28 Hz |
Why Use This Sub Box Calculator?
- All Enclosure Types — Sealed, ported, bandpass
- Port Velocity Safe — < 17 m/s
- Material Calculator — MDF, bracing, damping
- Global Units — cu ft, liters, inches
- SPL & SQ Ready — Competition proven
Sub Box Calculator Pro Tips
- Round ports reduce chuffing — Use 4" minimum
- Brace every 12" — Prevent panel flex
- Seal with silicone — 100% airtight
- Port 1.5× driver diameter — Avoid turbulence
- Test with tone generator — Verify tuning
Design Your Sub Box Now
Feel the bass. Use the sub box calculator trusted by car audio champions worldwide.
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