Ive just installed Polk Audio coaxials in both front and back doors using this as a guide:
http://forum.ih8mud.com/threads/rear-door-speaker-upgrade.329297/
http://forum.ih8mud.com/threads/front-door-speaker-upgrade.327663/
I have also added polk Audio 1" tweeters to the top of the A pillars, the tweeters are running off the pumpkin double din android head unit and the coaxials are fed by a kenwood 4 channel amp.
Bass/Sub bass is provided by a TEAC active sub that lives under the passenger seat,
I had bought two amps before i realised that there is no room under the back seats to mount amplifiers, I got round this by using the existing rear quarter subwoofer mounting plate to mount the kenwood amplifier on a bit of plywood.
Sound is obviously not sound-off spec (im not lead lining the 80 as its heavy enough already) Bass is punchy and strings and vocals are clear from just the coaxials (I may amp the tweeters later)
I've been pushhing appetite for destruction through it along with a little foo fighters and Nirvarna ........ ITS F**king GREAT