Further what that link describes is in fact simply getting accoustomed to a speaker through listening.
The tests I have run for years on various speakers have all been before and after tests .
Listen for an hour and take notes of things that stand out good or bad.
Then let play for a few days and listen again to the exact same passages.
The difference is most cases is very subtle ... but definately there with some brands more than others.
I've found this to be especially true of any passive radiator system where the PR usually takes a few good days or even weeks to reach an efficient peak.
This is also true of any really stiff surround driver.
Most all subs in my experience improve with time
