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# AVAudioUnitEQ

An object that implements a multiband equalizer.

```
class AVAudioUnitEQ
```

## Overview

The [`AVAudioUnitEQFilterParameters`](/documentation/AVFAudio/AVAudioUnitEQFilterParameters) class encapsulates the filter parameters that the [`bands`](/documentation/AVFAudio/AVAudioUnitEQ/bands) property array returns.

## Topics

### Creating an equalizer

[`init(numberOfBands:)`](/documentation/AVFAudio/AVAudioUnitEQ/init(numberOfBands:))

Creates an audio unit equalizer object with the specified number of bands.

### Getting and setting the equalizer values

[`AVAudioUnitEQFilterParameters`](/documentation/AVFAudio/AVAudioUnitEQFilterParameters)

An object that encapsulates the parameters that the equalizer uses.

[`bands`](/documentation/AVFAudio/AVAudioUnitEQ/bands)

An array of equalizer filter parameters.

[`globalGain`](/documentation/AVFAudio/AVAudioUnitEQ/globalGain)

The overall gain adjustment that the audio unit applies to the signal, in decibels.


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