How would I go about adding speakers to my 6 speaker car?

[Coleybouleoliss]

I added a JL sub and I have a set of Alpine S2-S65C speakers coming. I can't help but notice the open speaker grilles above the 6.5 speakers in the door. Is there a relatively painless way to take advantage of these empty speaker locations?

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[Andy Feuer]

First you need an OEM integration piece. Either PAC Amp Pro or Nav TV/Zen (I use the Nav TV).
Then either a DSP and amps, or amp with DSP built in. The speakers in the upper doors are 3.5" drivers and there are tons to choose from. You can make this real easy: Go to see Chris St.Clair at Trixx Customs in Chasska, MN.