[janwh]

While the little hack is surely fun, this is an underrated comment. The tuning that SONOS speakers do at setup will also not help if the speaker's own signal characteristics are taken into account for generating the system transfer function between input signal, speaker, and room. That's how SONOS, BOSE, et al. achieve a consistent sound in the first place.

So the result with different speakers will be mediocre at best and indeed far from high quality, even with a high quality speaker strapped on to it.