Usually 6.5" in the front doors and 6x9 in therear deck. Best to check the stock ones before purchasing speakers. They could end up being 5.25" in the front and 5x7 in the rear deck.
6.5 in front
THe ECU is underneath the dashboard in KIA Spectra 2004.
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My 2009 spectra has 6.5" door speakers. On a semi related note, there's a lot of rattling coming from the right one. I'm gonna replace them soon with kicker speakers and make sure they're mounted correctly.
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2008 kia spectra 'SPARK PLUG GAP;.040
In order to replace the speakers you have to flip down the rear seats and look at the screw ports and remove all the screws to remove the panel covering the speakers. The rest is self explanatory.
2002 Spectra is a Siemens 1.8 liter, 2004 is a Bosch 1.6 liter...totally different.
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