This is specially for you Frogman, since you're equating "soul" in mathematical terms, I'm going to give you some "super soul". In order to capture the nuance on this one cut "Blue Funk", I first had to get to the "high end of the high end"; 45 RPM vinyl, Sota Saphire, modified Rega Tonearm, Grado Sonata cartridge. Grado is sneered on here because they wouldn't recognize soul if it bit em in the ass.
Tube pre and amp is a must. Any speakers that have good solid midrange and bass are sufficient; soul is source critical. This is not about having the deepest pockets, but about selecting the best components for the job.
This is the LP;
[url]https://www.youtube.com/watch?v=zUnID70IU-g&list=RDzUnID70IU-g#t=563[/url]
I'll get back to you next year when you have the mathematical calculation.
Enjoy the music.