Hi Raymo...
got this from the manual i found...here:
https://www.hisense-usa.com/support/...oogle-tv-65u7k
Page 36:
Audio Output
to Select Speakers
Press the "settings"button on your remote control to select Settings > Display & Sound > Audio Output > Audio
Output Selection.
Select the speakers which you want to use.
*settings button is the one that looks like a geared wheel