how much would it cost to replace the right door speaker on an '06 kia spectra?

It shouldn't cost too much! It all depends on what brand of speaker you chose to have installed! All that needs to be done is take off the door panel (look in your car manual for removal) the speaker will be mounted by 4 screws, just remove the screws and disconnect the positive and negative connectors. plug the new speaker in, remount the screws, and put the door panel back on and your done! look in your maunal for the size of speaker you need before you buy a new set!
 
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