you have most probably just blown a fuse. When the wire came out it probably came into contact with metal and BAM! lol. other than that a wire may have fallen out. Oh, and those amp looking things are called crossovers, they filter the treble to the tweeters, and the more bassy notes to the larger (woofer) speakers).


So just check all your fuses first. Dont forget theres a fuse box under the hood as well as just next to the steering wheel so have a look in both.