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I used industrial stength double sided mounting tape and mounted it inside the door up against the interior side. This way its out of the way, easy to get to, and wont get wet..
I ran new wires into my door, and used zip-ties to zip tie the crossover up under the dash area. Easy access, won't get wet, and dosen't rattle itself everytime I shut the door.
putting the passive x overs in the door is a bad idea put them in the kick panel. I fyou have your speakers there put them high in the dash or under the console.