ahh i see well i can get the cadence for the front !
but Coaxians are neeeded in the back as either they didnt' put the tweeter on, OR, its Coaxian built in because there is no spot on the door for a tweeter, but in the front there is! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
Correct.
Here's a few that would be good in the rear doors
These Hi-Vi are sensitive enough to be good ran off the head unit, but have a high enough power handling capability to be able to run off an amp as well:
Hi-Vi Autosound CF260 6.5" Coaxial car Speaker - Pair: Madisound Speaker Store
These Aura's are quality speakers on a close-out price, way cheaper than you'd usually find them. They have a lower power handling capability so if you amp them later, you won't be able to drive them very hard. The advantage is, with their higher sensitivity rating, they will be great off of headunit power:
Aura 6200RPM 6-1/2" 2-way Coaxial Speaker Pair 269-184
And finally, these Bravox. A bit beefier, and could stand up plenty well to amp power, but also cost a bit more. Great speaker at a still modest price:
SSA Store - Bravox Audio CX60K Coaxial Speakers
Personally, I'd go with the Aura sounds in the middle. Because they are not only the most affordable while still being comparable in quality, they have a desirable heightened sensitivity rating. Personally I don't amp my rear speakers, I only amplify my fronts. Many people don't even run rear speakers. This is because of the sound stage theory. The ideal listening experience is to recreate the sounds of a live recording or performance. You want to hear the sound coming from in front of you, like a performer on stage. And having a lot of noise in the rear defeats that. You usually can't even hear the speakers in the rear, they just mess with the sound stage. And with how strong my front speakers are set-up, I can't hear my rear speakers at all. I just run them back there for whatever friends might be in the back seat.
That said, many people just leave stock speakers plugged in to satisfy the back seat passengers, you're really not gonna hear em up front. Just another thing to think about.