To enable TSHD on your Vizio sound bar, you need to use the remote control that came with your sound bar. Here are the steps to follow: Press the Menu button on the remote control. Use the arrow keys to navigate to the Audio menu. Select the True High Definition Sound option and press Enter. Use the arrow keys to turn TSHD on or off. Press the Exit button to close the menu. Note that the exact steps may vary depending on the model of your Vizio sound bar.