Hi Drew! You can control the volume of the HW-T650 Soundbar with your FireTV Stick remote. First, ensure your TV and HW-T650 Soundbar are plugged into HDMI ARC connections. You will then need to enable Anynet+. Press the Home button your TV remote, and then navigate to and select Settings > General. Select External Device Manager, and then select Anynet+ (HDMI-CEC) to turn it on. ^Gina