Hallo Alex
Du hattest mir wieder eine Hoffunung gegeben, dass ich das HU mit vernünftigen aufwand tauschen könnte. Jedoch habe ich an verschiedenen Anbietern auf Granit gebissen. Dies ist die meist konstruktive Info von Autoharnesshouse.com.
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The 4201 adapter doesn't fit the 2017 forester.
The other adapters we sell on our page do not work with cars with the 2017 Harman Kardon system as-is. That system is very hard to bypass/replace.
Essentially, there isn't a good way to turn on the existing Harman Kardon amplifier so we must bypass that and replace it with an aftermarket amplifier. You'll need to run RCAs from the new headunit to the new amp. We can supply adapters that will allow you to connect the new amplifier to the speaker connections on the existing amplifier. This wiring is $40 (it is needed in addition to the other harnesses we sell on this page:
https://www.autoharnesshouse.com/49021b.html ).
Your car has 8 speaker channels (Front tweeters, Front Door, Rear Door, Subwoofer) so you'll probably need enough amp channels to connect to each of the speakers.
Another option is to use the Maestro RR and the adapters that they sell with it to retain the amp.
We don't sell or provide support for that unit but this is the only way that I know that the Harman Kardon amp can be used with a different headunit.
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Das mit dem Maestro RR Teil muss ich aber genauer anschauen. Tönt irgendwie interessant.
Grüsse
Alain