No audio signal.
This is how 6.3 mm plug and PowerCON meet.
There are XLR and Speakon combo connectors designed for things like this.
But this is PowerCON connector designed to carry mains power.
Read more on PowerCON at https://www.epanorama.net/newepa/2018/10/01/powercon-connector/
Fortunately the 6.3 mm plug here only connects to the center ground pin. In TS plugs the S connected to powercon ground contact. With TRS plug the R connected to powercon ground.
Another interesting thing is that you can plug in US mains plug to get connection to live and neutral pins on powercon jack. Not recommended to use for any real application. Blue PowerCon is defined to be for power input and gray is used for power-out.
You can push in also USB A connector (can bend slightly).