depending on how you hooked up the wire to the 6x9 it is crossover with the coils unless you used the bypass connection and the crossovers for the 2 way i hooked them and just zip tied the slack then put them in the hole before i put the speaker in. also i used pac speaker plugs so i didn't have to cut off any connectors plus that keeps ya form having to figure out pos+neg
do you plan on puttin a sub in?
i know something about dsp's to get the most out of them good shops use a RTA but most people just adjust them to their liking.
did you watch any YT video's on it. jbl and infinity are essentially the same thing