New answers tagged stereo
I would recommend getting a usb audio device ("USB soundcard"). I'm not an expert audiophile, but an amazon search for usb audio interface will reveal a lot of price points to give you different audio out options which should sound better in a stereo system than the headphone port.
After testing with a friend's iPhone I replaced the cable an it is working now. The connection feels tighter than the old one did even when it was new, so the old one may have just been defective.
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