Hello, the Dabman can receive Bluetooth music from a mobile phone.
Unfortunately, such audio output devices are generally unable to transmit, as they are designed to play music via the integrated speakers themselves.
To put it simply, you can think of it like a pair of headphones. They also play the music themselves and do not transmit anything to other devices, even though they are connected via Bluetooth.
I don't quite understand the logic behind sending music from the Dabman (stereo audio system) to a Bluetooth box (mono) when the music from the smartphone could also be sent directly to the Bluetooth box....

I have (unfortunately) had the same experience as Adi 1. Trouble!!!
For better or worse, I then connected my Bluetooth speaker with a cable