Distortion is a great way to enhance low frequency content, adding harmonics in upper parts of the spectrum. It can be controlled with a bit of EQ and works very well on percussive sounds such as a kick drum. Blue Cat’s Destructor is a great tool to do this quickly and efficiently, as shown in this video tutorial.
Watch as Jerry Mateo Beefs up an 808 Kick Drum with Blue Cat Audio’s Destructor Distortion plug-in!