The 2014 kia optima speaker size is6-3/4" for the front and the rear of the car, with the side speakers use tweeter speakers. although speakers do not raise your vehicle's value by much, they enhance the driving experience. of course, you wouldn't want to have low-quality speakers in a top-rated car. it's, therefore, important to match your speakers with the car.a far more important factor is that your rear speakers can output sound at an appropriate volume for your front speakers. in short, this means they should be as loud (but never louder) than your main speakers, and by extension will usually be smaller, satellite speakers instead.
The 2014 kia optima speaker size is 6-3/4" for the front and the rear of the car, with the side speakers use tweeter speakers.