If the Event ID 16, Bluetooth fails to connect keeps troubling you; this post may help. Event ID 16 appears in the Windows Event Viewer if your computer has failed to establish a Bluetooth connection.

As fun as it is to blast your favorite songs (or Netflix shows) from your PC speakers, it's generally a no-no for those of us who live with others. That's where a good pair of Bluetooth headphones ...

I am assuming here that both the devices are paired. You can confirm that by going to Settings > Devices > Bluetooth. You can then follow the tips mentioned below if the Bluetooth speaker is connected ...