component speakers are just the tweeter and mid bass drivers seperated you will defent need a cross over so the sound can be processed to the right area on the speakers, the tweeter goes in behind the mirror on the corsa and the mid bass goes in the bottom of the door if i was you the best place to mount the cross over is behind the mirror if it will fit then it doesn't show any scum that u have uprated speakers.
Components will usually come with a cross over in the pack. They have one wire in from the HU and then two out, one for the tweeter and one for the door speaker. Dont necessarily need amp, but even a small one will make quite a difference - i had one up behind the glove box!
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