Over the long haul (and it has been), the old 3-thirds (speakers, amplification (pre & power or integrated), sources) has more or less held true in my experience of 55ish years....
This is taking into account new, used, diy with very little 'room', since there's been a lot of them that I/we haven't owned. And most were 'problematic' ( i.e., "One copes as best as....")... ;)
The later ones' (early 80's and beyond) have responded decently to analog eq and later digital correction.
Best 'splaination:
I am not afraid.
*L*