When buying a TV soundbar, there are several things to consider:

-Compatibility: Make sure the soundbar is compatible with your TV, either through Bluetooth or a wired connection.

-Sound Quality: Look for a soundbar with good sound quality, including clear dialogue and strong bass.

-Size: Consider the size of your TV and the space you have available for the soundbar. Some soundbars are designed to be mounted under the TV, while others are meant to sit on a shelf or table.

-Features: Some soundbars come with additional features such as a built-in subwoofer or the ability to connect to other devices wirelessly.

-Brand and Model reputation: Check the reviews, comparisons, and brand reputation in the market

-Additional technologies like Dolby Atmos, DTS X or other immersive sound would give a more enjoyable experience while watching movies.