Available article translations:

Bluetooth headset switches to mono when starting the virtual machine

  • Parallels Desktop for Mac Business Edition
  • Parallels Desktop for Mac Home Edition
  • Parallels Desktop for Mac Pro Edition


  • Audio quality becomes low
  • Sound is distorted
  • Only right channel is working


This behavior is caused by a Bluetooth headset built-in feature which automatically switches from high quality stereo sound (AD2P profile) to mono (HFM) when a microphone is in use.

The feature's activation is triggered by a Windows 10 Cortana virtual assistant that is enabled by default.


To prevent the headset from switching to HFM profile, apply any preferable workaround from the listed below:

  • Change the default input source for Windows

    Open the virtual machine's configuration > Hardware > Sound > set Input source to Built-in Microphone or to Mute if you do not use the microphone in Windows.

  • Change the default input source for the Mac

    Click on Apple Logo on Mac menu bar > System Preferences > Sound > Input > choose Internal Microphone.

  • Disable Cortana in Windows [ADVANCED]

a9c6e0b6a5209e617a7c0dd5eace86cf 1e5db16426987d561060acdf56d947b4 f9b6a8d63f3437e0dca35c9704a9033c 4987860c21de5849bcebfeb0472cfd03

Was this article helpful?
Tell us how we may improve it.
Yes No