SlotStudio

SlotStudio is a free subwoofer box designer, slot port calculator, and aero port calculator. Live 3D preview, instant tuning frequency, port length, net volume, and full cut sheet. No signup. Best experienced on desktop.

GMK SlotStudio

SlotStudio

Port Type

Units

*Wood Thickness (in)

*Box Width (in)

*Box Height (in)

*Box Depth (in)

Port Height (in)

*Port Width / slot (in)

P1 Length (in)

*P2 Length / L-leg (in)

Driver Vol (Vd) (ft³)

Drivers (qty)

Tuning

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Hz

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Port Area Ratio

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in²/ft³

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Net Volume

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ft³

Drag to rotate · Scroll to zoom · Dbl-click to reset

About SlotStudio

SlotStudio is a free subwoofer enclosure designer that handles both slot ports and Aero ports, built for car audio competitors and serious DIY builders. Enter your box dimensions, port geometry, and driver displacement to get instant calculations for tuning frequency, net internal volume, port area ratio, and a full cut sheet.

What it calculates:

Box tuning frequency (Hz) using Helmholtz resonator math with end correction
Net internal volume after subtracting wood thickness, port displacement, driver displacement, and optional bracing
Port area ratio to help you tune for SPL, daily driver, or musical applications
Full cut sheet with every panel dimension, including L-shaped slot port walls

Slot ports vs Aero ports:

A slot port is a rectangular vent built from the enclosure walls themselves, typically sharing one or more walls with the box. SlotStudio supports straight and L-shaped slot ports with automatic P1 and P2 leg length calculation, plus options for extra baffles, 45° corner bracing, terminus bevels, and bevel edges.

An aero port is a round flared tube port, available in standard PVC 3", 4", 6", 8", and 10" diameters or a custom diameter you specify. SlotStudio handles multi-port designs and lets you position aero ports on any wall — front, left, right, or rear — with adjustable depth, height, and lateral placement.

Who it's for:

SlotStudio is built by an active car audio competitor for builders who care about getting tuning right the first time. Whether you're chasing SPL records, designing a daily driver, or building your first ported box, the math accounts for what actually affects tuning.

Features:

Live 3D enclosure visualization with drag-to-rotate, scroll-to-zoom, and explode views. X-ray mode shows internal port geometry. Every dimension updates in real time as you adjust inputs. Export your design and cut sheet when you're ready to build.

Free, no signup, runs in your browser. Built and maintained by GMK Audio. Check out our other free car audio tools: Alternator Size Estimator, Wire Gauge Calculator, Subwoofer Sd Calculator, and GMK Detonator.