Thank you for your response. I’m, of course, aware that Beosound level and Beolab 11 are from different generations and functionalities, but I also need to mention three aspects here that I believe play a role:
1- Bang & Olufsen’s philosophy encourages integration, where Masterlink, network link and older versions of the links are good examples and mixing products from different generations has never been a problem from what I understand
2- Sound doesn’t discriminate between old and new designs but is perceived by us as listeners. BS-level, for example, cannot reproduce the lowest signals with proper pressure due to its physical form, so adding a range of missing signals could potentially improve it. You are correct about the devices being balanced individually but within their physical capacities. It is clear, for example, that a three-way speaker sounds fuller than a two-way speaker as it covers the range of the sounds better/less compromised.
3- Finally, the perception of sound depends on the individual listener, which is why everyone in this forum suggests that we should listen to the speakers before buying. After listening to my BS levels, I feel that BL11 could improve the sound image (for my taste)
Having all of this said, I do, of course, respect your view, while that is not what I asked. I wondered which technical solution could provide the best and most seamless solution to combine the speakers from a purely technical perspective.