Have you noticed as your system improves?

I agree with Paul McGowen who says music should be played appropriately loud.

There's a restriction of resolution when the volume knob is too low. Low volume acts like stepping on the brake pedal.

It's reasonable to play acoustic music at a natural volume level in order to sound 'real'. Isn't that what we're trying to achieve? Think how loud a single live violin player would sound standing in your living room or any live instrument. Trumpet? Clarinet? Piano? An acoustic trio would be WAY too loud? In a condo the neighbors would complain. 

A good system can/should play louder levels without fatigue and enhances the 'live' experience at appropriate levels for the genre being played. I'm not paying for an expensive system that can play music well at lower levels. Not an attribute for a live experience.

However, whatever works for you is good.

As my systems have improved over the decades this is exactly what has happened to me. My systems have become completely satisfying at lower volumes. Most of the time I now listen between 65 and 75db. 
 

Typically I go through an upgrade cycle about every seven to ten years. Typically it takes a couple years to upgrade… because of the intense research and breakin of components that is necessary between new components.

@gdaddy1  +1

You listen at lower volumes as you age. I’m a 38yr carpenter and I can’t take loud volumes anymore even if I’m listening to the cult. I measured cutting an outlet opening inside a cabinet for an outlet with a multi tool and it was 120db! I’m afraid my hearing is going as well. Sometimes it seems as if people are mumbling to me when they speaking. I guess this is why I love my system very much on the warm side. All carpentry tools are horrifically on the bright side. I’ve improved it with tubes and high end interconnects and yes, I’m hearing the difference and liking it. I stay away from tweeters that are beryllium or titanium or ribbon. It’s all silk dome for me. 

Aging matters hearing.