matching cartridge and speakers

A lot of talk about matching cartridge and arm, and cartridge and phono. And rightly so.
However, that's not all, I believe. These are two points where energy transformation happens. The rest, with the exception of turntable itself, are just supporting structures and "wire with gain". Cartridge and speakers make music.
Well, outside of the room acoustics, the speakers and cartridge are the two types of components that deviate the most from linear response. It's because they are electro-mechanical instead of purely electrical devices.

That acknowledged, how would you match them? Would you get printouts of the frequency response curves from all the main contenders and see where they compliment or don't compliment one another? Then just add the room acoustics to that equation and you'll likely have quite a saucy stew.

Cheers :)
Interesting question, because you are right, all is a "chain". The X-over from the connected speaker can be a 'black hole' or can serve you more information. When that one is done right it is possible to hear more information, even when the overall gain from your source components is lower...