• This 7.2-channel 4K Ultra HD network AV receiver features Dolby Atmos® and DTS:X™ object based surround sound. The free MusicCast Controller app makes it easy to access your music library and streaming music services. Add audio in up to 9 additional rooms with MusicCast wireless speakers or other MusicCast devices. Wi-Fi®, Bluetooth® and AirPlay® wireless connectivity, advanced speaker configurations and Zone B audio provide added system versatility.