This tutorial will provide for you the necessary information for this error. If you are experiencing this problem than just follow this steps:
Step 1. Wake up your headset if it is in standby mode
■ Check if SteamVR is running
■ SteamVR > Settings > Audio > In the Set Playback Devices > choose HTC – VIVE or speakers
■ Open Windows > Volume icon > Playback devices > choose HTC-VIVE-0 > Set as default device
■ You may need to also do this: select any audio device you choose > Show Disabled Devices and Show Disconnected Devices
■ Volume icon > set the volume slider for HTC-VIVE-0 to 50%
■ Open Windows > Volume icon > Speakers 2-USB Audio Device > Set as Default Device.
■ Plug in the headphones into the extra USB ports on your headset
■ Because of extra latency when sending audio over USB.
■ Some headphone jacks may not fit properly into the cable panel on your headset.
■ Try to fully plug them in or you can use the audio extension cable that you get with Vive.
■ Open Windows > Volume icon > Playback Devices > Highlight HTC-VIVE-0 or 2-USB-Audio Device.
■ Select the highlighted device > Test.
■ If your headphones are working properly than you will hear two sounds, one after other.