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The 2008 Kia Optima offers two audio setups - one with the upgraded Infinity Audio system. This upgrade doesn't change the speaker size but does enhance the sound quality. Both configurations include front door tweeters, 6-3/4 inch front door woofers, a 6-3/4 inch rear deck center, and 6-3/4 inch rear door speakers. The advantage is that the Optima uses a common speaker size, so finding suitable replacements for an upgrade should be easy. While the Infinity speakers were top-of-the-line in 2008, there are now even better options available in 2021. If you're confident in your skills, swapping out the Optima's speakers can be done with a few hours of work and some effort.
The door panels are suitable for 6.5-inch speakers, which is the same size as the aftermarket ones I have installed, and they fit perfectly within the factory mounting brackets. I've also been curious about the dimensions of the rear deck for possible speaker upgrades.
The speaker size for both the front and rear doors of the 2008 Kia Optima is 6.5 inches, and there is an additional sub speaker located in the trunk dash region.
The 2008 Kia Optima has 6.75-inch speakers in both the front and rear of the car, along with a subwoofer speaker located in the door.