Open the trunk and look up on the back deck. It doesn't matter what model civic you have, all Hondas are pretty much straight forward. There should be three or four small bolts (probably 10mm or a little larger) holding the speaker grilles and assemblies into the rear deck. Loosen these bolts completely. Now pull the whole speaker system out from the rear deck and there will be three small screws holding the grille onto the speaker assembly. Take these out, and there are your stock speakers! install the new ones and voila! taken care of. email me with any other Honda questions, to noah_dion@Yahoo.com
Later
if its a dx u can't put rear speakers
yeah Thar all 10 mm and if its an si than you are more limited down to one size and Thar more tricky you gotta do it from the inside i had allot of trouble but its easily done and there's 3 screws under the grill in the trunk to get the grills off hope this helps everyone
6.5"
6x9
6.5" for both front and rear.
The stock front speaker size on a 2002 Honda Civic is 6.5 inches. These speakers are located inside the door panels of the vehicles.
To change the rear speakers on a 2003 Honda Civic, start by removing the rear speaker covers using a flathead screwdriver or a trim tool to gently pry them off. Next, unscrew the old speakers from their mounting brackets and disconnect the wiring harness. Install the new speakers by connecting the wiring and securing them with screws, then replace the speaker covers. Finally, test the new speakers to ensure they are working properly.
The 2013 Honda Civic has 34.3 in. of rear head room.
The 2005 Honda Civic has 37.2 in. of rear head room.
The 2011 Honda Civic has 52.1 in. of rear shoulder room.
The 2013 Honda Civic has 52.2 in. of rear shoulder room.
The 2006 Honda Civic has 52.1 in. of rear shoulder room.
The 2004 Honda Civic has 52 in. of rear shoulder room.
The 2014 Honda Civic has 52.2 in. of rear shoulder room.