# Prologic

> Stereo output, but data is encoded in a way that is picked up by a Pro Logic or Pro Logic 2 decoder and split into a 5.1 speaker setup.

## Definition

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

```csharp
Prologic = 7
```

### Remarks

The Pro Logic speaker mode is a surround matrix (up to 5 channels) encoded into 2-channel stereo (Dolby Pro Logic–style). Channel count is set to 2. Only use this speaker mode if you must support matrix decoding.

Without a decoder, it just plays as normal stereo.

Pros:

* Pro Logic works as stereo.

* You can decode to surround on compatible receivers.

Cons:

* This speaker mode isn't discrete.

* Quality depends on the decoder.

* Pro Logic is often treated as plain stereo today.