https://community.sony.dk/t5/xz-series/headphone-socket/m-p/3526685#M7520 I have no idea I'm afraid, but I've sorted it out. I uninstalled Smart Connect and deleted all its data, then reinstalled it. Bingo, it worked! Thank you for your interest. Wed, 11 Jan 2017 20:27:14 GMT BobLudE1 2017-01-11T20:27:14Z https://community.sony.dk/t5/xz-series/headphone-socket/m-p/3526683#M7518 <P>My headphone socket works fine with the supplied headphones, but simply refuses to work with any other output device. I've tried 4 pole and 3 pole jacks ...and absolutely nothing works!! I've also tried a 4 pole to 3 pole adapter...same thing. Help, please as I do like to play music through good speakers.</P><P>Thanks</P> Wed, 11 Jan 2017 14:36:38 GMT https://community.sony.dk/t5/xz-series/headphone-socket/m-p/3526683#M7518 BobLudE1 2017-01-11T14:36:38Z https://community.sony.dk/t5/xz-series/headphone-socket/m-p/3526684#M7519 <P><A href="https://community.sony.co.uk/t5/user/viewprofilepage/user-id/929449">@BobLudE1</A></P><P>Are you testing CTIA or OMTP headphones?</P> Wed, 11 Jan 2017 20:10:45 GMT https://community.sony.dk/t5/xz-series/headphone-socket/m-p/3526684#M7519 Uliwooly 2017-01-11T20:10:45Z https://community.sony.dk/t5/xz-series/headphone-socket/m-p/3526685#M7520 I have no idea I'm afraid, but I've sorted it out. I uninstalled Smart Connect and deleted all its data, then reinstalled it. Bingo, it worked! Thank you for your interest. Wed, 11 Jan 2017 20:27:14 GMT https://community.sony.dk/t5/xz-series/headphone-socket/m-p/3526685#M7520 BobLudE1 2017-01-11T20:27:14Z