After restarting your PC, launch Synapse 3. Click on Razer USB Sound Card and then click on "Mixer" to find the THX Spatial Audio menu. Activate “THX SPATIAL AUDIO” by toggling it on. Your THX Spatial Audio is now activated.

How do I use Razer THX spatial audio?

Open Synapse and choose your headset from the dashboard. Navigate to the "SOUND" tab and click on "OPEN WINDOWS SOUND PROPERTIES". Right-click on Speakers (THX Spatial – Synapse) and select "Set as Default Device". Go to the “MIXER” tab then turn on “THX SPATIAL AUDIO”.

Why does my THX spatial audio not work?

A recent Synapse 3 update has caused it to detect that you have one and set the audio playback device to "THX Spatial - Synapse". If your headset does not support THX Spatial, click on the speaker icon on your system tray and set the playback device to your active audio device.