A:Answer Hi LocoDiablo,
Thanks for your inquiry. Great news! The A9G TV will work well with the soundbar. To use the TV speakers with the soundbar setup, you'll need to add an optical cable aside from the HDMI cable. For more information, please refer to this link:
https://helpguide.sony.net/tv/gusltn2/v1/en-003/08-05_09.html
-Ralph