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You can upgrade the older units to bluetooth. But the speaker wiring is all wrong for amplifiers if you want good sound and fade control. I'm not sure if you can even hook a common ground system to an amp. Maybe there is another adapter for that? A mid 80's deck would be the oldest style that would have good 4 channel wiring.
I went with a modern Pioneer because of the iphone compatibility and hands free phone use. Too many bad reviews on the Porsche unit. I'm hoping it gets revised over the next few years. $1,200. is fine if it works properly.
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Derrick
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