coaxial install question

[-=Neuromancer=-]

I got 4 Infinity Kappa 62.5i's to replace the factory speakers. I was looking at the wireing codes for the GT-S and it looks like the fronts highs and lows are seperated already...so i was wondering, when i hook up my new speakers in the front should i use the infinity crossovers that came with my speakers or use toyota's high and low inputs? or my real question is: does the inputs to the woofer cover the whole range of sound or is it restricted only to low sounds?

also, i was just planning on using the crossovers for the rear speakers. that shounldnt be a problem right?

i just didnt want to run all new wires and stuff untill i get a new head unit and amp which will not be for a while..

thanks!