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Since you have logic 7 it's not as simple as the other 2 systems to install an aftermarket amp. Logic 7 uses a fiber optic connection between the headunit and stock amp. I got rid of the entire audio system and replaced the headunit with a double din nav(alpine s920hd). For speakers I got morel hybrid ovation II and Jehnert xe200s.
To keep the stock headunit you can recode to hifi, piggyback off the stock amp, or get a da2. I recoded my headunit to hifi and used it like that for a while but was never satisfied(possibly caused by the aux input). After replacing the headunit it sounds crystal clear through bluetooth or usb.
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