Connect external speakers to monitor?

Hello dear I have recently bought a monitor from ASUS for my PS4 (ASUS VS248hr). I would like to connect my Bose Soundlink III have synonymous everything connected correctly but the sound is still on the speakers from the monitor.

I hope someone with more experience can help me, maybe I'll have to buy an adapter and put it in a different port.

in the photo you can clearly see that the Aux cable (white) is plugged in correctly.

I thank you in advance.

The monitor is not an audio output but an input.

It's probably a sound input for the built-in speakers

You have to use the https://praxistipps.chip.de/...ssen_31289. The jack on your monitor is just for sound input.