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Yes, you will need to hook up these cables. I'm surprised you're getting sound at all. After installing a new head unit into my '97 Expedition with the Mach Sound System, I had to hook up two seperate amp remote lines to the constant 12v power send. One for my aftermarket subs, and the other for the seperate powered speakers that were stock with the truck. In the wiring this is either labeled as "amp remote" (or something else abbreviated along those lines) or "power antenna".
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