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I've searched, but havent had any luck. Can anyone provide the specs for all of the speakers in the 2011 SX? I have the Infinity system as well. THanks!
 

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6.5" in the doors, dash is its on size some have made 3.5" work though. sub is 8"
 

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Does this mean that there are 4 inch speakers at opposite ends of the dashboard along with q 4 inch center speaker I am replacing all speakers in mycar and have purchased all door ones already, but have purchased 2 3.5 inch speakers for the corners of the dashboard and would like to know if they'll fit
 

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3.5 inch speakers fit in the corners on the dash. I do not know the center channel speaker size, but would not change that anyway. I installed amp for door speakers and another amp for L7 solo baric. Also changed the 2 3.5 inch dash speakers and sound is amazing :)
 

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Dash speakers are not 4 inch. They are 3.5. I measured them and had some cutting done to fit 4" Focal speakers in the same location. The doors are standard 6.5, both the front and rears. Center channel is a 5x7
 

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2015 Kia 2015 Optima EX
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Since this is one of the first threads to pop up in a Google search on optima speaker sizes, I'll add to it.
2015 Kia Optima EX with the Infinity non-NAV system.

I hope to add speaker tests next week sometime.
Here's a few pics.

Dash speaker:


Dash speaker:



Center channel speaker:



Center channel speaker:
 
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