Every album, every pressing, and which copy plays best — compared by dynamic range.
DR measures how much the volume moves on a record. Quiet parts that stay quiet and drums that really hit score high. A record squashed to be loud the whole way through scores low.
The track list shows two more numbers for each song. Picture a volume meter. Peak is the highest the needle ever jumps. RMS is where the needle sits most of the time. DR is the distance between them. (RMS stands for root mean square.)
A low number doesn’t mean a bad record — plenty of great albums score low. It’s about how much the volume moves, nothing else.