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Message: [QUOTE="Texan6Seven, post: 1516660, member: 16369"] [url]https://pac-audio.com/catalog/amppro-amplifier-interfaces/ap4-fd21[/url] I bought one of these. Super easy to install. Gives a clean, 5V signal. It retains the Sony amp to keep all system chimes warning sounds and Sync functions. They have a wire harness coming out that plugs in line at the Sony amp with wire leads that can be installed to your aftermarket amp to run the mids, highs without cutting any factory wires. So far I’ve got a 10” Pioneer sub ran off a 500W Alpine and the bass sounds fantastic and gets punchier as you increase volume. Just waiting on that wire harness so I can get the mids, highs straightened out. [/QUOTE]

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