Do you know how the EQ controls work? (Low, Mid, High).
They each affect a different area of the frequency spectrum:
Low is from 0-125Hz (max) to 375Hz (min)
Mid is from 125Hz (min) to 375Hz-1250Hz(max) to 3750Hz(min)
High from 1250Hz (min) to 3750Hz-Infinity (max)
The (min/max) is the amount of dampening