An article from audiogeekzine.com discusses about multiband compression which involves taking an audio signal and breaking it into three segments which are them processed independently. While this is not an easy technique to master the result is the preservation of the depth of sound. Examples from drums and guitars show but the values and the pitfalls of using this type of technology.
If you want to learn more about multiband compression then check this full article:
How to use Multiband Compression