Thanx @onlyqualityhifi. That might be true for studio monitoring situations. I am no expert in that. But, in home situations that is certainly wrong and it does not matter which source I am using. It is certain that modern recordings are much more consistent than older ones. It is also certain that I listen to much less of the room than is usual. To my ear various recordings sound best at wildly different volume settings especially when jumping genres. If you try to set one volume level, calibrated for each source, some recordings are going to sound dull and others too bright. There are too many variables that play into this for one volume to work, from the mics used to the settings of the recording engineer. Then you are off to the mixing engineer and finally production of the source material, records, CDs and so forth. All involve setting levels. The quality of the home system including the room also play into this. Systems that tend towards sibilance can be uncomfortable to listen too at higher volumes.
An interesting aside. In the past I always thought sibilance was just a fact of life and you always had to live with some of it. The instinct is always to turn the volume down. This is not true. Over the years as my system improved sibilance became progressively less of a problem until now when I rarely have an issue with it. My volume levels have also steadily increased. It is not because or presbycusis either although I have a small amount. I certainly hear it in some systems and not others.