Horn simulation · Free · No install
Tapped, front-loaded, back-loaded, offset-driver, stubbed, compound, multiple-entry and Paraflex horns. See how fast the air moves inside the path, add stuffing span by span, and fold the result into a cabinet.
Every graph, schematic and fold on this page is output from the simulator’s own solver, computed when the page was built.
Horn types
Choose where each face of the diaphragm meets the path, and the simulator builds the acoustic network for it. Every type can share a workspace with your boxes, so you can compare them directly.
The driver’s front face feeds the main horn and its mouth; the rear face loads the rear chamber.
The driver radiates directly from its front face; its rear face feeds the horn mouth.
Both diaphragm faces couple to the same horn at the driver and rear-tap markers, with one shared mouth.
The driver enters partway along the main path. The path starts at a closed end and radiates at its mouth.
The driver feeds the main horn. A closed stub branches from the marked junction.
The diaphragm faces feed separate front and rear horn paths, each with its own mouth.
D1 drives the throat; additional independently driven entries couple at their marked positions. All share the horn’s acoustic load and mouth.
Driver between S2 and S7. H7 reconnects the auxiliary path at S4. H1 and H5 start at closed ends; H4 radiates through the shared mouth.
Shown as PH1. PH2, PH3 and PH4 connect the driver and the auxiliary path at different stations.
Build the path
A horn path is a chain of spans. Each span runs between two stations, with a length, an area at each end and a flare, and neighbouring spans share a station, so the path stays continuous while you edit. Change it in the horn editor tile or the enclosure panel, and the graphs follow.
Diagnostics
Particle velocity, pressure and acoustic impedance read the path at any station you pick, and a fourth graph shows the output of each mouth or directly radiating driver. Find the narrow section where air moves fastest before you cut a single board.
Tapped Horn example at 100 W in half space, 20–300 Hz. The same data drives the horn particle velocity and horn pressure tiles in the app.
Stuffing
Stuff any span: set the material’s airflow resistivity, from 100 to 100,000 Pa·s/m², how much of the span it fills, and which end it fills from. Absorption follows the Miki model for porous materials.
Stuffing is not covered by the Hornresp captures, and there is no validated mapping from its Miki model to Hornresp’s filling parameters, so the export refuses a stuffed design.
Fold into cabinet
Set the outside dimensions and Fold into cabinet packs the horn into them, searching straight, serpentine, spiral and hybrid folds. It shows the result in a 3D cutaway with a cut list, and adds the folded horn as its own enclosure so you can see what folding changed.
Examples
Works alongside Hornresp
The horn model is regression-tested against native Hornresp captures, and horns that fit Hornresp’s layouts export as native Hornresp records, so you can check a design in both.
Native Hornresp captures
48
horn designs across 8 families are kept as regression tests that re-simulate each capture. Across the 35 standard captures, SPL agrees to within 0.0004 dB.
Hornresp remains the reference for directivity and thermal power compression, which this model does not cover. Neither model accounts for bends or folds.
Front-loaded, back-loaded, tapped, offset-driver, stubbed, compound and multiple-entry horns, and Paraflex horns in all four variants, PH1 to PH4. Each can sit alongside sealed, vented, passive-radiator and bandpass boxes in the same workspace for comparison.
Its regression tests re-simulate 48 native Hornresp captures across 8 horn families, and on the 35 standard captures SPL agrees to within 0.0004 dB. That compares two simulators, not built cabinets. Stuffing is not covered, and the diagnostic graphs are checked only indirectly, through throat impedance on the front-loaded captures.
Yes, for horns that fit Hornresp’s layouts; a multiple-entry horn exports as a set of records. The export warns when something is simplified, such as EQ or several drivers combined into one, and refuses, with a reason, what it cannot represent faithfully, such as stuffing, more spans than Hornresp has slots for, or a multiple-entry driver’s delay.
Yes. Connected over MCP, Claude, ChatGPT or another client can read, edit and simulate every horn type in your workspaces with the same solver.
Each horn path is a one-dimensional wave model built from conical, exponential or parabolic spans, coupled to the driver’s Thiele/Small model. The model is linear. It does not include bend losses, directivity or thermal power compression.
Yes, for front-loaded, back-loaded, tapped and offset-driver horns. Set the outside dimensions and Fold into cabinet searches straight, serpentine, spiral and hybrid folds, shows the result in a 3D cutaway with a cut list, and can add the folded version as its own enclosure to compare. Bends are not modelled as losses, and it does not produce fabrication drawings.
Yes, like the rest of the simulator. You can build, simulate and fold horns without an account.