Windows 10 enables you to play the same audio on multiple output devices. The easiest way to do it is to enable “Stereo Mix.” Here are the instructions: 1. Right-click on the sound volume icon at the bottom-right (the megaphone) and choose “Sounds.” 2. Open the “Playback” tab, choose the primary audio device, and press “Set as Default.” 3. Go to the “Recording” tab, right-click on any blank space, and choose “Show Disabled Devices.” 4. “Stereo Mix” will show up in the list of devices. Right-click on it and press “Enable.” 5. Right-click on “Stereo Mix” again and choose “Set as Default Device.” 6. Right-click on it once more and select “Properties.” 7. Open the “Listen” tab and check the “Listen to this device” box. 8. Select the drop-down menu under “Playback through this device” and choose the secondary output device. 9. Press “Apply” and “Ok” in the “Properties” and “Sound” windows and restart your computer.