# Your first design

> Build a vented subwoofer in 00 Simulator step by step: pick a driver, set the box, read the response and see what breaks at 200 W.

Source: https://simulator.00aud.io/docs/start/first-design

Build a vented subwoofer for a real 12-inch driver, read the graphs that matter most, and see what breaks when you turn it up. Every graph here is the simulator’s own output for the same design.

## Pick a driver

Open [the simulator](https://simulator.00aud.io/app). A first visit starts as a guest, so there is nothing to sign up for. The **Welcome to 00 Simulator** dialog offers ready-made examples; choose **Start from scratch** and it opens **Add enclosure**. Later, **Add new enclosure** at the foot of the enclosure list opens the same dialog.

- Click the **Driver** box (it reads **Select a driver** until you pick one) and type `12.00SW`. The search matches manufacturer and model.
- Results under **Catalogue** show each driver’s model, brand, nominal impedance and size. The star makes it a favourite, listed under **Your drivers** next time.
- **Browse all** opens **Advanced driver search**: filters, and a table of size, impedance, Fs, Qts, Vas, Bl, Sd and Xmax for every driver. **Create custom driver** adds one of your own ([Drivers: find, create, import](https://simulator.00aud.io/docs/guides/drivers)).

Pick the Ciare 12.00SW. These four of its parameters shape this design; [T/S parameters in five minutes](https://simulator.00aud.io/docs/start/ts-parameters) covers the rest.

- **Fs:** 29 Hz: where the cone resonates in free air.
- **Qts:** 0.29: how damped that resonance is.
- **Vas:** 55 L: the suspension’s stiffness, as a volume of air.
- **Xmax:** 13.5 mm: how far the cone travels, one way, before it distorts.

With a driver chosen, the dialog suggests a type from the driver’s EBP (Fs divided by Qes) under **Suggested starting point**. For this driver it reads: _EBP 88 points toward a vented starting alignment at 82.5 L, tuned to 26 Hz._ Keep **Vented**, leave **Name** and **Colour** as they are, and click **Add enclosure**.

## Make it vented

The new enclosure starts from the suggestion. Its settings are in the **Enclosure** section under the enclosure list, and **Type** already reads **Vented**. Set **Volume** to 55 L and **Tuning** to 32 Hz, the box from the app’s Vented example. Then open **Port** and set **Diameter** to 100 mm, with **Number of ports** at 1.

_Figure: The Enclosure panel for this design: Type Vented, Volume 55 L, Tuning 32 Hz, Port length 356 mm, and the Port section open with one circular 100 mm port._

| Field | Value |
| --- | --- |
| Type | Vented |
| Volume | 55 L |
| Tuning | 32 Hz |
| Port length | 356 mm (follows from the tuning) |
| Port › Number of ports | 1 |
| Port › Diameter | 100 mm |

- **Port length** follows from the tuning and the port’s size: 356 mm here. It works both ways: type a port length and the tuning follows instead. The panel holds whichever you set last.
- **Results**, under the port, lists its cross-sectional area and **Port volume**, the space the port itself takes up inside the box.
- Prefer to skip the typing? [Open the finished example](https://simulator.00aud.io/app?template=vented) and carry on from the next step.

> **Not sure about the type?** [Choose an enclosure type](https://simulator.00aud.io/docs/start/enclosure-types) shows a starting example for each type and when each one is worth using.

## Read the response

A new workspace opens with the **SPL (dB)** tile: level against frequency, one curve per enclosure in its colour. This one is flat to within 1.7 dB from 40 Hz to 200 Hz and falls away below the 32 Hz tuning. Its F3, where it falls 3 dB below its loudest octave, is 30.3 Hz; F10 is 24.9 Hz.

_Figure: The SPL tile for this design at 200 W: flat from about 40 Hz up, falling below the 32 Hz tuning, with F3 marked at 30.3 Hz and F10 at 24.9 Hz._

Ciare 12.00SW in the 55 L vented example tuned to 32 Hz, at 200 W, half space, 1 m. Simulated when this page was built. At 1 W the curve has the same shape, 23 dB lower.

| Frequency | SPL at 200 W |
| --- | --- |
| 20 Hz | 93.1 dB |
| 24.9 Hz (F10) | 101.0 dB |
| 30.3 Hz (F3) | 107.9 dB |
| 40 Hz | 110.0 dB |
| 100 Hz | 109.9 dB |

- Click **F3** in the tile’s header to mark F3 and F10 on each curve. **F-point settings** beside it choose which points show and the level they are measured from; the default is **Auto · loudest octave average**.
- The level is at 1 m in half space until you change **Environment**, in the Driver panel. [Reading a response](https://simulator.00aud.io/docs/start/reading-a-response) covers what the shape tells you.

## Turn it up

Power is set per enclosure. Open **Power** in the Driver panel and set **Input power** to 200 W; the numbers under the slider are clickable. The curve rises 23 dB and keeps its shape, to about 110 dB. Two limits break first, on the **Excursion** and **Port Velocity** tiles (the example opens with both; otherwise add them with **Add tile**):

- **Excursion**: below about 19 Hz the cone travels past its 13.5 mm Xmax, the dashed line on the tile. Under the tuning the port no longer holds the cone back.
- **Port Velocity**: at the tuning the port does the work, and its air peaks at **28.4 m/s** near 30 Hz, over the 17 m/s warning line.

_Interactive walkthrough in the page: the simulator's own tiles running a short demo._

The app’s own SPL, Excursion and Port Velocity tiles running this design in your browser, as the power goes from 1 W to 200 W. Nothing here is saved.

> **Fix one thing at a time** A high-pass filter below the tuning keeps the cone in check: [EQ and filters](https://simulator.00aud.io/docs/guides/eq-and-filters). The port needs more area: [Fix a noisy port](https://simulator.00aud.io/docs/guides/noisy-port). [Limits: travel, heat and air](https://simulator.00aud.io/docs/start/limits) explains each limit.

## Keep it

As a guest the design lives in this browser, and the header reads **Guest project**. To keep it, click **Save** in the header:

- **Create free account** signs you in, and your guest project comes with you as a cloud workspace (an account that already has workspaces asks first: **Import guest workspace?**). A free account keeps up to 250 workspaces, saved as you go, with their revision history, on any device you sign in on.
- **Download .00sim** keeps a file instead, which **Export** › **Open 00sim project…** opens again.

> **Guest share links are public** **Share** in the header makes a link. Made as a guest, **Create share link** publishes it at once and lists it in the **Gallery**, and you cannot manage it or take it out of the Gallery later. Signed in, **Create draft** keeps it private until you publish. [Share and publish](https://simulator.00aud.io/docs/guides/sharing) has the details.

**Or ask your AI to build it**

Your assistant runs the same solver through the 00 Simulator connector and saves the design to your account.

> Using 00 Simulator, build a 55 L vented box tuned to 32 Hz with one 10 cm port for the Ciare 12.00SW, simulate it at 200 W, and tell me its F3 and where excursion and port velocity go over their limits.