The basic EQ setting is "bypass".
Seriously, think of car controls. It all depends what you want to do, turn left, turn right, accelerate, ect. Is there a basic control setting when driving a car? No, you probably won't survive the first mile with it.
Or is there a basic setting for a hammer or screwdriver? No, you just use them as required. Blindly hammering on a wall won't make a castle out of your house - it will destroy it.
I'm repeating myself (this is a classic): "I'm having a solution (an EQ), now looking for a problem!"
I mean, identify the issues and then look for a tool/method to fix it. It doesn't make sense to blindly fix issues that don't exist (which is a typical "I have 3000 cracked high end plugins in my VST folder, never read a manual. But they must be good for something, so I'll just throw them on my tracks to see if it helps" thingy).