So I decided to check out the Calf Bass Enhancer plugin which is in the "unstable" list.
It's an amazing plugin but it will probably blow your speakers if set too high...
I start with the default settings, turn on the "floor" set to 20Hz to make sure it's not sending out any sub frequencies. Then turn up the amount only to 2.
That's it... Maybe to 3... but any more and I feel like I may blow my speakers with so much bass!
This setting gives my bass an amazing low end.
The first time I tried it my whole house shook with what was coming out of my sub!
Anyway... Loving this plugin... but user beware!