to expand on this topic i will be doing some testing this week.... i am chasing DBs at this point, i will do some testing to get a base score, then i will add a line driver that i have laying around to see if it helps at all... daily i dont see a use fore it, but in chasing number like i am it may just help a tad,. i dont plan to see huge changes as my head unit it 4 volt output, and my amp only expects 6 volts.. and my driver is a 7 volt boost. anyway if you would like i can come back and share my findings... but they would be strictly SPL related.