How to connect my new iPhone to a conventional high end stereo system?

How to connect my new iPhone to a conventional high end stereo system?

Added (1). When I had the iPhone 4 I purchased a cable to connect to the amp. Now with my new iPhone, the cable connection is not compatable with my ne iPhone SE.
Any recommendations?

Hi so the earphone socket with a mixer in line is the only method that can be employed.

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