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As far as the speakers go I use the auto tone to get the best sound from the stock system. The sub woofer is on the left side of the Yukon in the rear cargo wall, it's where the spare tire went on the old ones. Now for the front speakers I would look into getting some A-pillars form the dealer for a Denali, they have the tweeters built into them. That should bring the sound field up to ear level.
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