89formula#1

hey guys i have my 6x9's and my 4x6's runnin off my head unit witch is 45 watts x4. i have an old optimus 100 watt 2 channel amp and some 8 guage wire laying around. i also have 2 hi/lo impediance adapters. i know that i wirew these in and they let me have rca's to hook up an amp but my question is wut are these adjustments for? wut do they do? well back to the point. do u think my 6x9's would sound better or no its not worth it. also how woudl i hook up another amp? i am thinkin i can just splice into my remote wire then run my rca's to the inpediance adapter and my ground to a gorund. but my power sire how do i do this can i just put it onto my battery right on top of my 4 gauge? thanks