Depending on your TV model. In the TV's sound settings, do you see something called "sound mode"?
sound mode options
Stand: In the standard mode you listen to the most balanced sound. No tones are emphasized, such as the voices or bass.
Optimized: With this function you make specific effects extra powerful. This makes the sound more spacious.
Strengthen: This amplifies the mid and high tones of the sound. This is especially useful when voices are difficult to understand.
Choose "Strengthen" mode and see if that helps.
