here is what i used after i pull the oem amp
https://www.dropbox.com/s/sz13g1ine4qduma/Fig%2045%20Radio%20Circuits%20W%20Amplifier.pdf
https://www.dropbox.com/s/sz13g1ine4qduma/Fig%2045%20Radio%20Circuits%20W%20Amplifier.pdf
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I have never seen any rear door speakers for any of the barn doors tahoe's. You sure they are factory and not 2nd hand? Post some pics, I would like to see tthem.
My bad for some reason I was thinking you meant on the barn doors