Aero Port vs Slot Port: Which Should You Use?
Round aero ports and rectangular slot ports both tune a vented box, but they fold, flare, displace volume, and chuff dif…
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Design boxes that hit.
Free subwoofer box builder with real physics simulation — not simplified formulas. Sealed, vented, and bandpass — calculate volume, port length, and generate printable cut sheets.
500
frequency points per simulation
5,000
configurations per optimization
3
enclosure types — sealed, vented, bandpass
Simulate. Optimize. Build.
From Thiele-Small parameters to printable cut sheet — three steps, zero guesswork.
Step 01
Simulate
Pick a driver, set your enclosure — get SPL, impedance, group delay, excursion, and port velocity from a full electroacoustic circuit model.
SPLGroup delayImpedanceExcursionPort velocity
Step 02
Optimize
5,000 candidates scored and ranked using Latin hypercube sampling with two-pass refinement. Weight for output, sound quality, or balanced.
Build-validatedMulti-objectiveCollision-aware
Step 03
Build
Dimensioned cut sheets with port routing, kerf bends, corner strips, and panel layout. 3D preview to inspect every joint before you cut.
Cut sheetsKerf bends3D previewPort routing
See it in action
Drag to orbit the enclosure. Every panel, port, and brace — rendered from your design in real time.
Drag to rotatePinch & rotate
Physically simulated. Not approximated.
Every effect that changes what comes out of your box is modeled in the circuit — not bolted on as a warning after the fact.
| RokketBox | Typical tools | |
|---|---|---|
| Circuit simulation | Included: Full electroacoustic equivalent circuit, 500 freq points | Not included: Simplified transfer functions |
| Radiation loading | Included: Bessel/Struve series on cone and port | Not included: Typically omitted |
| Port turbulence | Included: Iterative nonlinear convergence | Not included: Static warning or flag |
| Motor compression | Included: BL Gaussian falloff near Xmax | Not included: Not modeled |
| Cabin gain | Included: 3-axis standing wave model for your vehicle | Not included: Flat boost or not available |
| Cabin–port coupling | Included: Port impedance modified by cabin back-pressure | Not included: Port and cabin modeled independently |
| Voice coil inductance | Included: Lossy semi-inductance (Wright model), not ideal Le | Not included: Ideal inductor or omitted |
| Port end corrections | Included: Flanged vs free-end on both circular and slot ports | Not included: Single correction or none |
| Group delay | Included: Savitzky-Golay smoothed, plotted per config | Not included: Rarely shown |
| Subsonic filter | Included: Binary-search HPF keeping excursion within Xmax | Not included: Manual selection |
| Build validation | Included: Port routing rejects unbuildable designs automatically | Not included: User responsibility |
| Optimizer scoring | Included: De-scores high excursion, port chuff, and unfittable ports | Not included: No penalty for marginal designs |
Circuit simulation
Included: Full electroacoustic equivalent circuit, 500 freq points
Not included: Simplified transfer functions
Radiation loading
Included: Bessel/Struve series on cone and port
Not included: Typically omitted
Port turbulence
Included: Iterative nonlinear convergence
Not included: Static warning or flag
Motor compression
Included: BL Gaussian falloff near Xmax
Not included: Not modeled
Cabin gain
Included: 3-axis standing wave model for your vehicle
Not included: Flat boost or not available
Cabin–port coupling
Included: Port impedance modified by cabin back-pressure
Not included: Port and cabin modeled independently
Voice coil inductance
Included: Lossy semi-inductance (Wright model), not ideal Le
Not included: Ideal inductor or omitted
Port end corrections
Included: Flanged vs free-end on both circular and slot ports
Not included: Single correction or none
Group delay
Included: Savitzky-Golay smoothed, plotted per config
Not included: Rarely shown
Subsonic filter
Included: Binary-search HPF keeping excursion within Xmax
Not included: Manual selection
Build validation
Included: Port routing rejects unbuildable designs automatically
Not included: User responsibility
Optimizer scoring
Included: De-scores high excursion, port chuff, and unfittable ports
Not included: No penalty for marginal designs
See it before you cut it
Interactive 3D viewer with transparent panels and port routing visible inside the box. Inspect every joint, fold, and brace before you make a single cut.
Kerf bendsCollision avoidanceCorner stripsL / U / C foldsSlot & circular ports
Printable cut sheets, ready for the workshop
Every panel, port fold, brace, and corner strip — dimensioned and laid out on a single printable page. Take it straight to the table saw.
- Panel dimensions— Exact measurements for every piece, including kerf offsets
- Port routing layout— Fold lines, bend radii, and total port length shown in cross-section
- Bracing & strips— Corner strip lengths, brace positions, and driver cutout diameter
- Material summary— Panel count, total sheet area, and a cut list you can hand to a shop
From the Workshop
Design guides, physics deep-dives, and build walkthroughs.
How to Wire a Dual Voice Coil Subwoofer (Series vs Parallel)
DVC subs let you choose your final impedance. Here is exactly how series and parallel wiring change the ohm load, how to…
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SPL vs SQ: Designing a Subwoofer Box for Loudness or Accuracy
Maximum loudness and accurate bass pull the design in opposite directions. Here is how enclosure type, volume, and tunin…
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