WinISD golden dataset
93%
of 6,358 comparison points agree within tolerance across 50 WinISD projects: Sealed, Vented, 4th-order bandpass, and 6th-order bandpass boxes, on up to 9 graph metrics each.
- Within tolerance 5,911
- Watch 277
- Outside 170
Free · No install · Mac, Windows, Linux, iPad
Simulate speaker enclosures in the browser.
Sealed, ported, bandpass, passive-radiator and horn designs, with the graphs that decide whether a box is worth building.
- No account needed
- Checked against WinISD and Hornresp
- Connects to Claude and ChatGPT
WorkspaceHalf Space · 1.0 m
- Tapped hornB&C 21SW152 · 100 W
- SealedDayton Audio DCS205-4 · 50 W
- VentedCiare 12.00SW · 100 W
- Path length
- 2.50m
- −3 dB band
- 39–113Hz
- Peak at 100 W
- 123dB
- Excursion / Xmax, 25–120 Hz
- 6.0 / 15.0mm
Cone excursiondashed: Xmax 15.0 mm
Peak 6.0 mm at 100 W, 25–120 Hz
Every response graph and schematic on this page is output from the simulator’s own solver, computed when the page was built. The toolbox drawings are illustrations.
What will you build?
Pick a type. Start from a working design.
6 example designs, 2 of them horns. Each one opens in the simulator exactly as it is simulated here, ready for you to change.
Sealed · Dayton Audio DCS205-4
Sealed
Compact 15 L sealed alignment with a smooth low-end rolloff.
- Net volume
- 15.0L
- −3 dB
- 63Hz
- Peak at 50 W
- 102dB
- Excursion / Xmax, 20–300 Hz
- 7.0 / 8.8mm
ResponseHalf Space · 1.0 m · 50 W
Cone excursiondashed: Xmax 8.8 mm
Vented · Ciare 12.00SW
Vented
55 L bass reflex tuned to 32 Hz for deeper extension.
- Net volume
- 55L
- −3 dB
- 31Hz
- Peak at 100 W
- 108dB
- Excursion / Xmax, 20–300 Hz
- 8.9 / 13.5mm
ResponseHalf Space · 1.0 m · 100 W
Cone excursiondashed: Xmax 13.5 mm
Passive radiator · Dayton Audio DCS165-4
Passive Radiator
10 L PR alignment showing passive radiator behaviour and limits.
- Net volume
- 10.0L
- −3 dB
- 63Hz
- Peak at 10 W
- 93dB
- Excursion / Xmax, 25–300 Hz
- 4.3 / 6.0mm
ResponseHalf Space · 1.0 m · 10 W
Cone excursiondashed: Xmax 6.0 mm
4th-order bandpass · B&C 18SW115
Bandpass
Fourth-order bandpass with a 70 L sealed rear and a 50 L front tuned to 59 Hz, covering 41 to 89 Hz.
- Total volume
- 120L
- −3 dB band
- 41–89Hz
- Peak at 100 W
- 113dB
- Excursion / Xmax, 20–300 Hz
- 4.2 / 14.0mm
ResponseHalf Space · 1.0 m · 100 W
Cone excursiondashed: Xmax 14.0 mm
Tapped horn · B&C 21SW152
Tapped Horn
2.5 m tapped horn for a 21-inch driver, −3 dB from 39 to 113 Hz and 123 dB at 100 W.
- Path length
- 2.50m
- −3 dB band
- 39–113Hz
- Peak at 100 W
- 123dB
- Excursion / Xmax, 25–120 Hz
- 6.0 / 15.0mm
ResponseHalf Space · 1.0 m · 100 W
Cone excursiondashed: Xmax 15.0 mm
Multiple-entry horn · B&C 10PS26
Multiple-Entry Horn
Three 10-inch drivers, each on its own 50 W channel, share a 1.2 m horn that reaches 73 Hz.
- Path length
- 1.20m
- −3 dB
- 73Hz
- Peak at 3 × 50 W
- 128dB
- Excursion / Xmax, 20–300 Hz
- 3.8 / 5.5mm
ResponseHalf Space · 1.0 m · 3 × 50 W
Cone excursiondashed: Xmax 5.5 mm
Sizing a vented box? Use the bass-reflex port calculator to work out port length from box volume, tuning and port area.
AI · MCP
Your assistant, with a real simulator behind it.
A language model can’t do acoustics on its own. Ask one for a box and it reaches for rules of thumb, or makes up a driver’s numbers. Connect Claude or ChatGPT to 00 Simulator and it works the same validated solver you do: real driver data, simulations it can run and re-run, and graphs you can check.
- 1Add a connectorPaste the server URL into Claude, ChatGPT or any client that supports remote MCP.
- 2Sign in and approveUse your free 00 Simulator account and review what the assistant can do.
- 3Ask for a designIt searches drivers, builds and simulates enclosures, and saves to your workspace.
Your assistant
00 Simulator connectedYou: Design a tapped horn around a B&C 21SW152 and show me the SPL and excursion at 100 W.
Tools used: search_drivers, get_driver, create_workspace, simulate_workspace, render_simulation_graphs.
Assistant: Here is a tapped horn for the B&C 21SW152. Path length 2.50 m, −3 dB band 39–113 Hz, and 123 dB at 100 W in half space. From 25 to 120 Hz, peak excursion is 6.0 mm, comfortably inside the 15.0 mm Xmax.
Illustrative conversation. The tool names are the server’s own, and the numbers and curve are real output for this example.
Validation
Checked against the tools you already trust.
The solver is compared with WinISD and Hornresp on a growing set of reference designs, and the results are public, including where they disagree.
Native Hornresp comparisons
122
122 comparison cases across 8 horn families: 114 complete curve sets and 8 sampled diagnostic checks. 109 of 109 agreement checks meet their stated tolerances. The other 13 cases track stuffing-model differences, without claiming agreement.
- Front-loaded26
- Tapped horn22
- Offset-driver16
- Back-loaded13
- Stubbed9
- Compound13
- Paraflex13
- Multiple-entry horn10
The comparisons cover 20 Hz–5 kHz, with stuffing curves through 2 kHz and sampled diagnostics at three frequencies. Directivity, thermal power compression and bend losses remain outside this model.
These are comparisons between simulators, not measurements of built cabinets. Every result depends on the driver data you start from, and both models are linear.
The toolbox
Dynamic EQ, headroom, horn diagnostics, and more.
EQ right on the graph
Drag parametric, shelf and high- or low-pass filters on the response itself. SPL, excursion and port speed update as you move them.
Headroom before you build
Set a listening level and see which limit arrives first, from cone and passive-radiator excursion to thermal power and port air speed, plus the voltage and current the amplifier has to deliver.
See inside a horn
Particle velocity, pressure and acoustic impedance at any point along the path, the output of each mouth, and fibrous stuffing placed span by span.
Fold it into a cabinet, Alpha
Pack a front-loaded, back-loaded, tapped or offset-driver horn into the box you have, move the boards, compare the folded result with the design you started from, then take a cut list or a 3D view.
Compare, then share
Overlay variants and your own measurements in one view, save the tile layouts you like, and send any design as a link or publish it to the gallery.
Bring your files
Import WinISD drivers and projects, Unibox sheets and REW measurements, paste a spec sheet, and export to WinISD or Hornresp when you need to.
Check whether the port can handle your target output with the port velocity calculator.
Driver library
3,200+ drivers, checked before they reach a simulation.
Search the 00 Bits library across 48 brands and every driver arrives with its Thiele/Small parameters tested for internal consistency. Not listed? Paste a spec sheet, import a WinISD driver file, or type the numbers in.
Find a driver in the simulatorB&C21SW152
Parameters consistent- Fs
- 32Hz
- Qts
- 0.36
- Vas
- 200L
- Sd
- 1,680cm²
- Bl
- 39.0T·m
- Re
- 6.0Ω
- Mms
- 450g
- Xmax
- 15.0mm
Brands in the library include
- Dayton Audio
- Eighteen Sound
- B&C
- FaitalPRO
- Visaton
- Tang Band
- Wavecor
- CIARE
- Jensen
- Beyma
- Celestion
- SB Acoustics
- Eminence
- Oberton
- PRV Audio
- Monacor
- Sica
- Peerless
- PHL Audio
- P.Audio
- Lavoce
- Scanspeak
- REDCATT
- HiVi
- SEAS
- BMS
- RCF
- SB Audience
- Acoustic Elegance
- Morel
- and 18 more
Get started
Start from an example, or from nothing.
- SealedSealed · Dayton Audio DCS205-4Open example
- VentedVented · Ciare 12.00SWOpen example
- Passive RadiatorPassive radiator · Dayton Audio DCS165-4Open example
- Bandpass4th-order bandpass · B&C 18SW115Open example
- Tapped HornTapped horn · B&C 21SW152Open example
- Multiple-Entry HornMultiple-entry horn · B&C 10PS26Open example
- Blank workspacePick your own driver and enclosure type and start from scratch.Open simulator
- Browse the galleryPublic designs shared by other builders, ready to open and change.Open the gallery
Is it free?
Yes. You can design, simulate and share without an account. A free account adds cloud workspaces with version history, share links you can keep as drafts, hide from the gallery or revoke, and the connection for AI assistants.
Does it work on a Mac?
Yes. It runs in the browser, so it works on Mac, Windows, Linux, iPad and phones without Wine, a virtual machine or an install.
How does the AI assistant connection work?
00 Simulator is a remote MCP server. Add it as a connector in Claude, ChatGPT or any client that supports remote MCP with sign-in, and the assistant can search drivers, build enclosures, run simulations and render graphs in your workspaces. Saved changes appear in version history, and it can try temporary changes without touching the saved design. With a workspace open you watch it work, and workspaces it creates start as drafts, so you only keep the ones you want.
Is it a WinISD alternative?
For everyday box design, yes. It imports WinISD driver and project files, exports WinISD projects, and runs on any platform. WinISD still has decades of tutorials behind it, so the comparison page sets out where each tool is the better fit.
Can it model horns?
Yes, in alpha. Front-loaded, back-loaded, tapped, offset-driver, stubbed, compound, multiple-entry and Paraflex PH1 to PH4 horns, with Max SPL, stuffing per span, and particle velocity, pressure, acoustic impedance and radiating-output diagnostics. The Fold tile packs front-loaded, back-loaded, tapped and offset-driver horns into a cabinet. The horn model is one-dimensional and linear, and its regression tests compare it with 122 native Hornresp captures. Designs export to Hornresp.
How accurate is it?
It uses electro-mechanical-acoustic circuit models built from Thiele/Small parameters, plus a one-dimensional wave model for horn paths. Across 50 WinISD projects, 93% of comparison points agree within tolerance, and every deviation is published. Like any simulator, results are only as good as the driver data, and they are not a measurement of a built cabinet.
Where does the driver data come from?
From the 00 Bits library of 3,200+ simulation-ready drivers across 48 brands. You can also import WinISD driver files and Unibox spreadsheets, paste a manufacturer’s spec sheet, or enter parameters by hand.
Are my designs private?
Yes, until you share them. Guest designs stay in your browser, and account workspaces are private to you. A guest share link is public and listed in the gallery straight away, and it cannot be withdrawn. With an account, a share link starts as a private draft that you can publish, hide from the gallery or revoke later.