My subwoofers aer faving upward toward my trunk roof, if i manage to fit them to face the driver will they be louder and have more bass? Actually i know they will but how noticable will the change be? also will my trunk and car rattle more with them this way? maybe becuase of the sound pressure in the car from the new direction in which they are facing? I was also wondering if getting a speaker amp would increase the amount of bass alot. my friend ahs two small speakers amped by kicker and i have four polk speakers unamped and mine already have more bass.