I learned a long time ago. It is not how loud your system can play, it is how soft your system can play and bring you all the detail and expressions you want.
Good thing I practice that. In my present living conditions, it is essential. Or I'll get evicted.
I chuckle to myself when I hear or someone tells me, "It sound better the louder I play it". Sure, it does sound great. Turn the level down, the bass disappears and image collapses. Okay.... not for me.