Roon uses EBU R128 to calculate dynamic range while most people in the audio world, including the Dynamic Range database, use a crest factor algorithm. Here is something I posted on the Roon forum:
EBU R128 is perfect for volume leveling and the fact that Roon uses this to do volume leveling is great. People wanting the Dynamic Range Database DR numbers too is not a criticism of that choice. It is a realistic request based on the fact that the DR database numbers are more reflective of the actual amount of compression any given track may have. Look at this:
“Unlike R128 and BS. 1770 meters, DR measures dynamic range from the perspective of a music engineer’s needs. In contrast, R128 and 1770 are designed to control loudness for commercials , not measure dynamic range for music, especially pop music. DR isn’t designed for broadcast loudness control, it’s purpose is to gauge the amount of dynamic range reduction, or the absence of dynamic range contrast. Designed by a member of the EBU ploud committee, the same body that created R128, DR informs an engineer about how much the mix is being or has been “stepped on,” dynamic range-wise, not about “will it pass through a broadcast chain without loudness reduction?”
I used to use volume leveling but I have turned it off. Why? Two reasons. First, it was sucking the life out of the music. It was diminishing the soundstage by making it less 3D. Second, I started listening to full albums almost exclusively so volume leveling became unnecessary as I have a remote control volume and don’t mind making an adjustment for each album. Though most of the time I don’t feel the need.