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The 2015 Kia Optima LX is equipped with a sound system that features 6-¾ full range speakers in the front doors, a single 5-¼ speaker in the center of the front dashboard, and another set of 6-¾ full range speakers in the rear doors. Some versions may also include a single 8 full range subwoofer situated in the center of the rear deck. In case you need to replace the speakers, it's likely you'll have to opt for 6-½ replacements as 6-¾ speakers are less common. To accommodate the size difference, you'll have to use a speaker adapter that attaches to the factory openings in the front and rear doors, reducing the hole size by ½ to ensure the new speakers fit correctly.
The 2015 Kia Optima LX comes equipped with 6.75-inch speakers in both the front and rear doors, an 8-inch speaker located at the center of the rear deck, and 3.5-inch speakers located in the corners of the dashboard.