Sorry, I don't agree at all about the sound, to my ears it's abominable, extremely LOUD with no dynamics left and the highs are boosted very much. Real earbleeders so to speak. I got rid of the complete series, which, by the way, covers the years 1945-1960.
As a big 1940s-1950s R&B fan I like the music on these discs very much, but the horrible sound was too much for me, I got headaches when I tried to listen to them and that's not what music is for.