Who in the world designs such unconnectable speakers?

Aside from the nebulous “unconnectable”, you haven’t actually described your problem. While we appreciate hearing about your purchasing history throughout your lifetime, perhaps you could skip that and tell us what problem you are having?  

So you bought a really old, used, long out of production speaker, and decide to blast Sonos as the cause of the issue?

Seriously, give us users some information action on your setup and the issue and we can try to help, otherwise you can contact Sonos Support and get assistance.

​@ccb105, You can also write in French.

Well, we tried. 

But for those of us who are at least somewhat "technically" literate, everything in the "cult" works... 🙂🙂🙂

This probably should be moved to a different forum since OP isn’t interested in having their speakers fixed (or optimized).

Don’t feed the troll.

A person like OP is to be pitied as they have most likely blamed others for everything that has gone south in their lives. Such people are constantly looking for sympathetic agreement regarding their dislikes and/or lashing out with little to no explanation.

This case as a point. What the OP expected to find/hear in this community by such a rant boggles the mind. Especially so when refusing any assistance which is why 99% of people come here.