While a little overhang may add a slight perception that action isn’t perfectly synced up to sound on screen, the size of a soundbar compared to your TV size does not really matter unless you want to make sure the soundbar is not as wide as the TV and/or that the soundbar’s height and width will fit inside your TV’s stand legs and under the TV’s frame. The size of a soundbar may reflect the number of speaker drivers inside it and/or the amount of power it has to put out loud volumes. However, the soundbar will perform the same regardless of how big your TV is. If you want to make sure the soundbar is less wide than the TV, the best 55-inch TVs today are 48-51 inches wide (55 inches is the screen’s diagonal measurement). All the soundbars in this roundup, for example, are less wide than that. If you want to make sure the soundbar fits between a TV’s stand legs and under the TV’s frame, you’ll have to find out those measurements and compare them to individual soundbars.