Just wanted to follow up on this topic for future reference.
I was never able to resolve the speaker group issue on the eclipse. B&O could not help.
I ended up purchasing a beoconnect core and transmitter 1. Unfortunately, this setup does not produce the same audio quality as the eclipse being the source. The bass and me the 28s becomes (as best as I can describe it) empty, as if it initially punches but doesn’t follow through. The filters seems to do little, bass management nothing, and no other settings configuration seems to address the issue.
so sad 🙁