(-)dB on Ripped CDs

My (new-to-me) Innuos Zen streamer came with a lot of existing music on the internal drive. A lot of the titles have a suffix of (-XXdB), with the XX usually being somewhere between 30 and 50. I suppose the original 'ripper' was trying to manage the 'loudness' of certain CDs he/she was ripping.

Does that sound feasible, and does anyone here do such a thing when ripping CDs?
"This may not matter to you, but it does to me for various reasons, many of them illogical or irrational, but the vinyl hobby is not really logical or rational..." - member on Vinyl Engine
"Sometimes I do what I want to do. The rest of the time, I do what I have to." - Cicero, in Gladiator
Regarding collectibles: "It's not who gets it. It's who gets stuck with it." - Jimmy Fallon

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