If you want to listen from two Bluetooth devices at the same time:
Pair and connect your Bluetooth devices via the Bluetooth settings in Manjaro.
This is a PulseAudio Preferences utility that provides an easy way to enable simultaneous output.
yay -S paprefsYou can launch it by typing paprefs in the terminal or searching for it in the application menu.
Once paprefs is open, go to the "Simultaneous Output" tab and check the option to add a virtual output device for simultaneous output.
To apply changes. (may not be needed)
pulseaudio -k
pulseaudio --startOpen the sound settings and select the new virtual device as the output device.
You can fine-tune the volume levels for each Bluetooth device individually via pavucontrol.
yay -S pavucontrol
pavucontrolNow you should be able to play audio through multiple Bluetooth devices simultaneously.