# Quad

> The Quad 4.0 speaker setup which contains four channels.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.AudioModule

```csharp
Quad = 3
```

### Remarks

The Quad 4.0 speaker mode contains four channels:

* Front left

* Front right

* Rear left

* Rear right

Channel count is set to 4. The output layout provides four discrete channels (front and rear pairs of left and right). If a device doesn't support this mode, Unity picks a supported mode (often [AudioSpeakerMode.Stereo](/engine/6000.7/script-reference/unityengine/audiospeakermode/stereo.md)).

This mode is common in fixed installations and museums.

Pros:

* Quad is simple surround for four-speaker setups.

Cons:

* Quad is rare in homes.

* It's harder to test.

* It requires more setup.