Not enough information.
If there was one eq setting that made everything sound 'clear' regardless of the source material, the speakers and the acoustics of the environment then mixer manufacturers would just make all mixers with that one eq preset and not bother with adjustable eq.
What are you using the mixer amp for? Where are you using it (if using it for live sound)? What other gear are you using with it? What's currently wrong with the sound? etc.