I'm working on adding sound effects to a teleportation scene. I'm having trouble with the electric "zap" sound effect make a deep bass sound. I've looked up online and all i'm finding is how to add bass to music which isn't getting the effect i'm looking for.
Many times the best sound effects are a combination of several different effects mixed together. Particularly when it comes to science fiction effects as you are trying to create something that does not currently exist in nature.
For your teleportation, you might try mixing the zap sound you have with a low rumble or low drone sound. You will need to play with how much of each to mix and when to fade in and out of a particular effect.
I assume you're trying to add bass to your zap sound through boosting the lower frequencies with EQ. That isn't working for you because all EQ can do is boost the bass that's already there in the sound. It can't "add" bass that isn't already present. So mixing in an effect that has bass in it is your best bet.