processor needed?

[SynCity 2]

Hello, i've installed my new(er) system the other day currently i have

Optima Yellow top

2 SSA icons 12

2 Pheonix Gold Ryval 1000w 2 channel (each sub with their own bridged)

1 Pheonix Gold Ryval 1000w 4 channel

2 Kicker DS460 4x6

1 Pioneer DEH-P510UB

Will be adding getting

2 Kicker 08KS6930 6x9

1 SoundStorm SX310 crossover

if i'm not mistaken the crossover will prevent my mids and highs from "popping" and put a cleaner sound though, right?

also is a sound processor needed? i have a decent amount of "road noise" coming though, just enough to bother me. will the processor fix all that? or will the crossover fix it?