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iTunes / Question about Audio Files

My question concerns one of the details in the image below about volume.

After uploading several songs to my iTunes program and inspecting their playback levels,

I am confused as to what the category below for volume -6.0 dB actually means.

I know the dB = decibel. But what I've discovered is that several of the songs from the same CD or artist

can have various dB levels which increases or decreases the volume of the song, sometimes quite a lot.

I have also seen other songs where it shows volume +0.1 or higher.

What is the difference then between the and in the volume?

I don't mean to sound trivial, but again, the playback volume differs greatly in songs within the same CD

and I've noticed that the ones where the dB is greater are much louder than ones where there is a dB.

I'm trying to figure this out to better understand and try to account for this in my future purchases and uploads. I've searched the web but cannot

find any explanation.

Also, regardless of dB or , shouldn't I be able to set my iTunes where all of the songs playback at a similar level? I believe there's some sort

of adjustment I can make, is that correct?

Thanks for your assistance!

最後更新：2017-09-07 21:13:11