---
title: kIOAudioSelectorControlSubTypeChannelLevelPlus4dBu
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.12+]
path: kernel/1646407-anonymous/kioaudioselectorcontrolsubtypechannellevelplus4dbu
---

# kIOAudioSelectorControlSubTypeChannelLevelPlus4dBu

## Declaration

```occ
kIOAudioSelectorControlSubTypeChannelLevelPlus4dBu = '4dbu'
```