1987 CD Release
When The Beatles albums were first remastered digitally for their 1987 CD release the mastering job done wasn’t particularly good. In fact many people have said that it was downright terrible. I won’t go that far. But I will say that it’s clear that they didn’t know exactly what they were doing at the time and that mastering for CD has come a long way since then.
The new remasters were painstakingly done on the highest tech equipment you can find in the world. This should allow new details to be heard in the music. Tech New Master
Other Bands Have Had Their Catalog Remastered Since Then
Unlike The Beatles, most other bands of importance (such as The Rolling Stones and Pink Floyd) have had their albums remastered since their original CD release already.
Basically, these new remasters are a long time coming! It’s been 22 years since The Beatles albums were digitally mastered and in that time there have been a lot of advances in digital audio.
Mono Mixes On CD For The First Time
In 1987 only the stereo versions of most of their albums were released leaving the original mono mixes locked away. With this new remasters release, those mono mixes are included in a “Mono Box Set” which includes each of The Beatles first 10 albums mixed in mono along with a “Mono Masters” CD set which includes mono mixes of non album tracks.
Only the first 10 albums are included because the last three albums (Yellow Submarine, Let It Be, & Abbey Road) were only mixed in stereo in the first place.