@russ69 -- "Unfortunately it's an indication that your loudspeakers are not cutting it. Even without any tone controls, all your music should sound great with no reason to adjust things."
I have to somewhat disagree with that -- recordings are all over the place in terms sound quality. The vast majority of commercially recorded music has already been mixed, eq'd, limited, compressed and otherwise processed to some degree. Different artists, engineers and producers have their own opinion as to what a particular recording should sound like, and that will also be influenced by the sound signature of the microphones, studio monitors and other equipment used for that work. So, it is no surprise that when you play things back in your home, some recordings just sound better to you than others.
As such, some people like the ability to tinker with the sound by using tone controls or an equalizer. Along those lines, Schiit offers three well regarded EQ units at attractive prices. Or, you can also explore the use of digital software equalizers. Roon can do this as well as some other digital players and software.