Adjusting the headphone volume through the controller
1. From the PS4 Home screen Dashboard, scroll Up on the controller.
2. Scroll to Settings and press the X button.
3. Scroll to Devices and press the X button.
4. Scroll to Audio Devices and press the X button.
5. Scroll to Volume Control (Headphones) and press the X button.
Note: This can only be selected when a headset is connected.
6. Adjust the Volume Control bar to the desired setting by moving left or right.