Question Head phone jack not working on monitor

[Jturner1658]

On my vizta monitor everything works fine but the headphone jack I wanna connect my studio monitors to via the 3.5mm jack but when I plug it in the audio still comes through the monitor and not the speakers. If you can help it’ll be great appreciated.

https://www.frys.com/product/9984286?site=sr:SEARCH:MAIN_RSLT_PG&requestComingFromSearch=true

 

[popatim]

Specs say its an audio out jack, not a headphone jack.
Please check your user manual to confirm.