This is a Geek Squad Certified Open Box Product. See below for more information. A 5.1 channel powerhouse, the VSX-534 4K Ultra HD AV Receiver takes the sound quality of your home theatre system to new heights. Dolby Atmos and DTS:X systems offer excellent gaming or movie experience. Dolby Atmos Height Virtualizer and DTS Virtual:X make sure that you get virtual 3D surround effect even without surround speakers.