A:Answer Hi Texas,
To Adjust the volume on your speakers, you can press the +,- button on the top of the speakers. If your smart TV doesn't have Bluetooth, you can connect the speakers through the audio in connection using a 3.5mm headphone jack. Here's a link for additional information.
https://helpguide.sony.net/speaker/srs-xb21/v1/en/contents/TP0001599456.html
Regards,
Sam
Sony Social Support