Atom Echo linked to other speaker for playback?

Is it possible for my Atom Echoes to always respond/playback media-music etc. to a different speaker? I have my google speakers default to a better speaker, for example. The Echo is of course not built to be a speaker (but that’s the default).
I think I can write a program for every single request and playback the response, but why not have an “always” option to point to a better speaker?

try this, maybe this way still works.

Thank you, I also found this more current method: