In the product description of the BADKRUKA loudspeaker it reads:
"The multi-speaker mode allows you to connect this speaker with all our other Bluetooth speakers that have this feature – and enjoy the same music from several speakers."
I am having difficulty figuring out what "all our other Bluetooth speaker that have this feature" means. Online there are no more details published anywhere where I looked so for. For example, it would be quite useful if BADKRUKA could connect to one or several KALLSUP loudspeakers, but it is unclear if these are actually compatible. KALLSUP does say it only works with KALLSUP, but then again, the BADKRUKA is newer and perhaps the KALLSUP text just has not been updated properly? ...maybe it is all just wishfull thinking. I would like to use one or two BADKRUKAS for the main sound body in the room and distribute KALLSUP loudspeakers to support a room filling immersion on the cheap.
Unfortunately I have no BADKRUKA loudspeaker myself right now to test it, but I would be interested if anyone who bought the BADKRUKA also has a few KALLSUPs lying around and was able to test this. Cheers!