After carefully installing the Vizio SB2821-D6 I was soon ready to give it only a two-star rating, because the sound seemed like it was coming from two hollow soup cans, no matter how controls were tweaked. Then, the second day, purely by happenstance, watching a movie, I was suddenly surrounded by miraculously airy, transparent, full spectrum, high quality theater sound, with rich sonorous treble, presence, and full bass, so unbelievable that I instinctively looked around the room to identify the source. The secret lies in the sound source,, itself. Most TV sound sources are atrocious, but not all. Before you are tempted to return this bargain-priced system, test it out with an FM receiver or several sources of certain high quality before blaming this Vizio, which, although not equal to a first-rate home theater system, now gets four starts, because it delivers all that it claims to be.