What can be done if your bass sound doesn’t quite cut it in the low end?
Before considering EQ, you may want to add some depth by using an extra sub-oscillator in your synth. The typical approach is to use a sine wave tuned an octave lower, with no modulation. Here’s how it’s done in Logic’s ES2 synth plugin:
Notice how the sub-bass oscillator adds extra low end without altering the vibe of the current bass. Note, though, that you may need to tweak the level in order to rebalance the mix (and avoid blowing too many sub-woofers).
Low-end enhancers such as Waves MaxBass also sometimes have a place, but really only as a last resort.
There are a number of different ways in which these tools work. Most commonly, they create the impression of louder bass by adding harmonics higher up the frequency spectrum.
Always check your mix on a few good systems if you start messing with sub enhancement, as there can be a very fine line between a subtle, clean sub-bass and a complete mess.