The AVR-X4000 7.2 Channel Network Home Theater Receiver from Denon combines advanced networking technology with powerful surround sound performance and an attractive aluminum front panel. Audyssey DSX and DTS Neo:X let you enjoy a dramatically enhanced front soundstage via additional front height or wide speakers. The receiver’s network functionality supports Internet radio services such as SiriusXM, Pandora, and Spotify. Support for Apple’s AirPlay technology means that you can stream music from your iPod touch, iPhone, or iPad via your home network, as well as from iTunes on your PC or Mac. The sophisticated video processor includes SD-to-HD upscaling, along with 4K Ultra HD (3840×2160) for the next generation of 4K Ultra HDTVs.