New high-definition (HD), big-screen TVs are great to look at. But not all sound as good as they look. Even the best TVs don't offer the sound quality of DVD movies and HDTV programs. To get that, many people install expensive surround-sound systems. That means hooking up speakers and a receiver. It usually includes running wires all over the place. Now there's an easier answer - sound bar speakers. These are small speakers in one little, rectangular box. It sits above or below the screen. Most sound bars have all the audio and video connections you need. That means no receiver and no wires.What is this passage mostly about?