# Compare

> Plot two quantities against frequency with separate vertical axes, and choose useful pairs for acoustic, mechanical and electrical comparisons.

Source: https://simulator.00aud.io/docs/reference/tiles/compare

Compare puts two different measurements on the same frequency chart. Use it to connect output with the effort behind it, or to inspect electrical magnitude and phase together.

- **Shows:** Two different quantities against the same frequency axis, each with its own vertical scale.
- **Healthy when:** The pair answers a question, and you read each curve against its own units.
- **If it is not:** Choose a useful pair under **Left axis** and **Right axis**, or start with **Presets**.

## The tile

Choose **Left axis** and **Right axis** in the tile’s settings. The left quantity is solid; the right is dashed. Each visible enclosure keeps its own colour. The horizontal axis remains frequency: this is not a scatter plot of one quantity against another.

> **Read the correct scale** A crossing between a solid and a dashed curve does not mean their values are equal. The two vertical axes have different units and scale independently. Use the hover readout for values at the same frequency.

## Useful pairs

| Preset | Question it answers |
| --- | --- |
| **Excursion + Group Delay** | Where do travel and delay rise together? |
| **SPL + Amplifier Load** | What electrical demand accompanies this output? |
| **Impedance + Electrical Phase** | Where is impedance low, and what is its electrical phase? |
| **SPL + Excursion** | Where does cone travel buy useful output? |
| **Max SPL + Limit Excursion** | How much travel is used at the maximum-output ceiling? |
| **Port Velocity + Excursion** | Where does the port take over from the cone? |

For a vented box, **Port Velocity + Excursion** makes the handover near tuning easy to see: the cone’s travel dips while the port speed rises. For amplifier questions, **Impedance + Electrical Phase** keeps the two electrical quantities together.

## Available quantities

| Quantity | Unit |
| --- | --- |
| **SPL** | dB |
| **Max SPL** | dB |
| **Excursion** | mm |
| **PR Excursion** | mm |
| **Port Velocity** | m/s |
| **Rear Port Velocity** | m/s |
| **Cone Velocity** | m/s |
| **Port Volume Velocity** | L/s |
| **Group Delay** | ms |
| **Acoustic Phase** | ° |
| **Impedance** | Ω |
| **Electrical Phase** | ° |
| **Amplifier Load** | VA |
| **Current Draw** | A |
| **Power at Limit** | W |
| **Excursion at Limit** | mm |

Choose different quantities for the two axes. A quantity that does not exist for an enclosure, such as passive-radiator travel on a sealed box, has no meaningful curve. Do not interpret an absent line as a passing limit check.

## What to try

| Try | What it changes |
| --- | --- |
| [Output and effort](https://simulator.00aud.io/docs/reference/tiles/excursion) | Compare SPL and excursion to find frequencies that cost travel for little sound. |
| [Electrical load](https://simulator.00aud.io/docs/reference/tiles/impedance) | Compare impedance and electrical phase to understand the changing load. |

## Ask your AI

**Ask your AI**

> Using 00 Simulator, compare SPL and excursion in my visible designs over their intended working band. Identify frequencies where extra travel gives little output, and put the relevant response and limit tiles on screen.