# EQ Editor

> Edit filters directly on the SPL chart, select the correct enclosure or horn driver, and check the result on excursion and headroom.

Source: https://simulator.00aud.io/docs/reference/tiles/eq-editor

EQ Editor keeps the selected enclosure’s filters open on its SPL graph. Every edit changes the simulated signal, so the other response and limit tiles follow it.

- **Shows:** SPL with editable filter handles for the selected enclosure or horn driver.
- **Healthy when:** The response has the shape you need and the filtered design still passes its travel and power checks.
- **If it is not:** Select the correct enclosure, adjust one filter, and recheck **Excursion** and **Headroom**.

## The tile

The tile is always in filter-editing mode. On other supported charts, the **EQ** button enters that mode and **Exit** leaves it. Select the intended enclosure first; for a multiple-entry horn, also select the driver whose filters you mean to edit.

| Control | Action |
| --- | --- |
| **Add filter** | Right-click the chart to add a filter at that frequency. |
| High-pass or low-pass triangle | Drag sideways to change cutoff; open its control for type and slope. |
| Parametric or shelf dot | Drag sideways for frequency and vertically for gain. Selected handles expose bandwidth where applicable. |
| **EQ / filters** | Use the side panel for exact values, enabled state and deletion. |
| **Copy from...** | Copy another enclosure’s filters; the copy dialog replaces the current filter set. |

## Check the cost, not just the shape

_Figure: A high-pass reduces the low-frequency travel demanded by the vented example._

Vented example at 200 W, with and without a 25 Hz Butterworth high-pass. Half space, 1 m; simulated when the page was built.

| Excursion after EQ | Peak | At |
| --- | --- | --- |
| No filter | 21.2 mm | 10 Hz |
| High-pass enabled | 6.3 mm | 24 Hz |

Here the plotted peak excursion falls from 21.2 mm to 6.3 mm. The high-pass also removes low-frequency SPL. Keep **SPL (dB)** and **Excursion** together to see whether that trade suits the band you need.

> **Boost asks the driver to do more** Bass boost raises travel and electrical demand where it raises voltage. It cannot increase the driver’s intrinsic maximum-output ceiling. Check **Headroom**, port velocity and passive-radiator travel after the response looks right.

## What to try

| Try | What it changes |
| --- | --- |
| [Protect the bottom octave](https://simulator.00aud.io/docs/guides/eq-and-filters#protect-the-cone) | Add a high-pass below the useful band, then compare its cost in SPL. |
| [Compare without deleting](https://simulator.00aud.io/docs/guides/eq-and-filters) | Disable a filter in **EQ / filters** to compare the result, then enable it again. |

## Ask your AI

**Ask your AI**

> Using 00 Simulator, preview a protective high-pass for my selected enclosure. Compare the original and filtered SPL, cone excursion and port velocity at the current power, and explain the lost bandwidth before saving any filters.