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I'd go with a Rockford DSR 1 for the Sony system. became common, so I'm not sure how these all interact in a modern system. Sorry if I'm asking something obvious, but I don't have experience installing car audio systems since touch-screens, voice control, DSP, etc. What would you recommend as the best upgrade path to improve the sound and functionality (ideally, without tearing apart the whole vehicle interior and spending a lot of money)? I'm essentially looking to upgrade to something equivalent to the Sony premium system or better. I would probably do the installation myself (I've installed a few basic car stereo systems over the years). I'm not looking for a super-loud system or exaggerated bass - just good, clean sound. I do want to be able to easily access music stored on a memory stick (or something similar). I don't want to compromise my back seat storage area with large subwoofers. I'm assuming that a more powerful amplifier and upgraded speakers would be worthwhile.
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Unless there is a compelling reason to replace it, I'd prefer to keep the OEM head unit. I don't want to give up any of the factory functionality (Sync, etc.). I've read through this forum, and I see that people do some very significant system upgrades that can take many hours of work and cost well over $1,000. If it had the upgraded Sony system, I'm sure I would be happy with it. It is pretty loaded, including navigation with an 8" touch-screen, but it has the standard stereo system. I'm looking at buying a 2015 F-150 Lariat Supercrew 4x4.