Well if you can you would probably be a pretty good engineer. I would keep any existing filters cleaned regularly and if you are using a bag They tend to have better air flow when first installed(empty). You didn't mention what type or for what purpose. If you are cleaning carpet you need agitation, air flow,and suction. Setting it too low would cut down on air flow. Too high would increase air flow but you would not get the suction down where you need it. You might get some better answers if you add details.
