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# AudioEqualizer3Band - ComfyUI Built-in Node Documentation

> Complete documentation for the AudioEqualizer3Band node in ComfyUI. Learn its inputs, outputs, parameters and usage.

> This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/AudioEqualizer3Band/en.md)

The Audio Equalizer (3-Band) node allows you to adjust the bass, mid, and treble frequencies of an audio waveform. It applies three separate filters: a low shelf for bass, a peaking filter for mids, and a high shelf for treble. Each band can be independently controlled with gain, frequency, and bandwidth settings.

## Inputs

| Parameter      | Data Type | Required | Range         | Description                                                                                                                               |
| -------------- | --------- | -------- | ------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
| `audio`        | AUDIO     | Yes      | -             | The input audio data containing the waveform and sample rate.                                                                             |
| `low_gain_dB`  | FLOAT     | No       | -24.0 to 24.0 | Gain for Low frequencies (Bass). Positive values boost, negative values cut. (default: 0.0)                                               |
| `low_freq`     | INT       | No       | 20 to 500     | Cutoff frequency for Low shelf filter in Hertz (Hz). (default: 100)                                                                       |
| `mid_gain_dB`  | FLOAT     | No       | -24.0 to 24.0 | Gain for Mid frequencies. Positive values boost, negative values cut. (default: 0.0)                                                      |
| `mid_freq`     | INT       | No       | 200 to 4000   | Center frequency for the Mid peaking filter in Hertz (Hz). (default: 1000)                                                                |
| `mid_q`        | FLOAT     | No       | 0.1 to 10.0   | Q factor (bandwidth) for the Mid peaking filter. Lower values create a wider band, higher values create a narrower band. (default: 0.707) |
| `high_gain_dB` | FLOAT     | No       | -24.0 to 24.0 | Gain for High frequencies (Treble). Positive values boost, negative values cut. (default: 0.0)                                            |
| `high_freq`    | INT       | No       | 1000 to 15000 | Cutoff frequency for High shelf filter in Hertz (Hz). (default: 5000)                                                                     |

**Note:** The `low_gain_dB`, `mid_gain_dB`, and `high_gain_dB` parameters are only applied when their value is not zero. If a gain is set to 0.0, the corresponding filter stage is skipped.

## Outputs

| Output Name | Data Type | Description                                                                                                            |
| ----------- | --------- | ---------------------------------------------------------------------------------------------------------------------- |
| `audio`     | AUDIO     | The processed audio data with the equalization applied, containing the modified waveform and the original sample rate. |