Did you compare the two samples I just posted? I just think the original is WAY low...
Just listening now. Comparing the original to the same file (
The Choirboys - Pie Jesu) I compared your 9dB boosted to earlier and the original is around the same average volume to my ear, if not louder. But, there is a lot more going on musically in the Sade song.
Just out of interest, comparing your file to mine in Reaper alongside another file of completely different music. Sex Pistols - Anarchy In The UK mp3 320kbps file ripped straight from CD. All 320kbps files. (Bear in mind that Pie Jesu is a classical song with choir vocals being the main sound and the Pistols are a full band)
There is what appears to be quite a bit of headroom on all 3 tracks. The Choirboys and Sade both come in between -4dB to -4.5dB where the pistols come in around -1.5dB on Reaper's meters. The Pistols very noticeably louder.
The question is do those numbers and waveforms we see give a reading of volume? A person whispering and an electric guitar solo both coming in at the same on the meter wouldn't sound the same volume would they? Surely the guitar would sound louder?
Applying 9dB, as you did, to the same files and Pie Jesu has notable artifacts when hitting the peaks as does the Sade song, they're not quite as noticeable as the first but there are some. Anarchy just sounds plain awful.
I guess in a perfect world, everything would be equal and you wouldn't have to adjust your volume control but as Miro said before me and after me, I'll say again, albums were and are created to be listened to as a package and mastered as such. I believe these days there is much more unity in the overall volume of music because people are working to different standards maybe? I don't know. But in days gone by, you got an album and it didn't matter if it was mastered to the same overall volume as your other albums because you would put it on and adjust your volume when listening to suit yourself. I'm sure flipping from Simon & Garfunkel to Jimi Hendrix on vinyl in the 60's probably required some volume adjustments. I know it would to me today.
But in answer to your question : Why is the album awfully quiet? It's not, really. It sounds fine. (To me)