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The 2013 Kia Optima offers three different audio setups. One includes a navigation system, another has an Infinity Audio system, and the third doesn't have either. Despite these options, the speaker sizes remain consistent. In the center of the dashboard, there is a 4-inch speaker with 2 ohms. The corners of the dashboard have 3-1/2 inch speakers. The front doors are outfitted with 6-3/4 inch speakers, the rear deck features an 8-inch speaker, and the rear doors have 6-3/4 inch speakers. These speaker sizes are quite common, making them easy to upgrade to aftermarket equipment if desired. Those who are really into audio will appreciate that the Optima's head unit can be easily upgraded, with plenty of compatible options available from major brands like Kenwood, Alpine, and Sony.
The 2013 Kia Optima comes with 3.5-inch corner dash speakers, 6.75-inch speakers in both the front and rear doors, and an 8-inch speaker in the middle of the rear deck.