OK, thanks for the various links. From looking at those links, this is what I have tried:
$ bluetoothctl list
[NEW] Controller 5C:F3:70:78:EC:8A liliput [default]
$ sudo hidd --search
sudo: hidd: command not found
$ sudo hcitool scan
The hcitool clearly doesn't find anything. As a side note, I can mention that I have tried connecting the speakers with my Win 7 system (the computer is dual boot), but am unsuccessful in Win as well. On the other hand... Connecting my Chromebook to the speakers is trivial, on par with mobile phones and iPad. Weird.