External speaker (Boss) is connected by Bluetooth but I get no sound.

Hello mapehu49,

Thank you for using Apple Support Communities. It's our understanding that there's no sound when connecting your Mac to external speakers. You've come to the right place! We're happy to help.

If you haven't already, take a look at the following resources to make sure that you've followed all steps to set up and use the speakers with your Mac:

Set up a Bluetooth audio device to work with Mac

Change the sound output settings on Mac

If the issue persists, check the instructions that came with your speakers and contact the manufacturer for further assistance.

Have a nice day!