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When i purchased my 2000 durango SLT the rear speakers produced no sound other than an occasional crackle. It has the infinity chrysler audio package. I was interested in replacing the entire sound system and i now have two sets of infinity 6022i's installed and i am now looking to install a new head unit because i assume the lack of power to the rear speakers was caused by a short in the stock stereo.
Before you rule out the deck, the OEM Infinity system has a separate amp located at the passenger side kick panel. You may need to make sure the amp itself is not bad before replacing the deck.