Dual audio

To enable Dual Audio, first pair each device with your Samsung Galaxy.
Go to Settings > Connections.
Click on Bluetooth and turn on the switch.
Enter pairing mode on your Bluetooth speakers.
Swipe down on the screen to access the Quick Panel and tap on Media.
Ensure both audio outputs are selected to start playing music from both speakers.
Once connected, you will be able to play the same sound on both devices and adjust the volume easily.

How to enable Device and Media buttons:

If you notice that the media settings are not available in the Quick Panel, you can easily enable this setting.
Swipe down to access the Quick Panel and click on More options.
Tap on Quick Panel layout.
Turn on Show Devices and Media buttons.
Once enabled, you will be able to view the Devices and Media buttons in your Quick Panel.