Non-subjective speaker test at home

Sheffield Labs drum track. Turn it up to 110dB.

Also rebuild or replace tweeters as the ferrofluid dries out after as little as two years. (ferrofluid drying out could be one of the reasons people report break-in of 600+ hours - common speaker designs are inadequate and run the tweeters very hot on loud music - obvious from soundstage speaker linearity tests like Magico S5- and once the ferro fluid dries out from the heat then the sensitivity of the tweeter drops and the speaker will sound less detailed and a bit smoother or duller)

"i know all speaker elements produce clean sound. What else?"

You've revealed a clear case of audio nervosa. You can't accept the simple test of them producing good sound, so you think you need more "testing  stuff"

I would just put them in their best position within the room and crack open a beer.

If they sound good to you a month from now then that's enough.

Speaker testing is not a science (outside $$$$$$ r&d facilities). There's just too many variables, the recording, the room, etc.

Whilst there's no such thing as a recording that sounds like real life I find that video recordings of friends and family can often sound spookily close to the real thing even on cheap speakers. Voices are revealing.