The YHT-S400's sound bar stands at 2-inches high and fits in front of most 32 to 50-inch TVs without blocking the screen. In addition, the feet of the sound bar can be adjusted horizontally or vertically, or taken off entirely, for additional installation flexibility. By integrating the system's subwoofer into the receiver, Yamaha is able to offer users an easy connection to a full-featured receiver without adding a separate component and the ability to place the unit in a rack or on the floor in tight spaces. 

For optimal sound quality, the YHT-S400 accepts HD Audio signals (linear PCM transmission) from Blu-ray disc players. Three 1080--compatible HDMI inputs enable three different HDMI sources to be connected to the receiver. Yamaha's UniVolume feature maintains a consistent volume level between different channel, programs, commercials and input sources. For instance, when watching TV, the volume of commercials will not be louder than the program being viewed. The same is true when switching sources to watch a DVD or Blu-ray movie or to listen to music on CD. This is particularly helpful for late night watching and listening when spikes in volume can disturb others in the house or apartment building. Yamaha's proprietary AIR SURROUND XTREME technology better delivers sound around the listener than other "virtual surround" systems. Dialogue is clearly heard from the center while ambient audio from on-screen action is clearly heard from the right, left and behind the viewer with smooth sound movement from position to position.