The Sony STR-DH550 5.2-Channel AV Receiver is designed to deliver powerful multi-channel sound. This receiver 5.2channel speaker output and delivers up to 145W per channel for robust audio playback. The receiver's front-panel USB allows you to connect additional audio sources like iPhones and iPods, and can also charge compatible devices. There are also two digital optical and a digital coaxial connection available for connecting digital audio sources. A calibration microphone is included for simplified speaker setup. The Sony STR-DH550 is well-equipped with video connections with four HDMI inputs. This model also supports pass-through of 3D and 4K video signals. MHL connectivity allows you interface compatible portable devices like smartphones and tablets for content sharing. Built-in high-resolution audio support allows you to take advantage of dynamic surround sound formats like DTS-HD and Dolby TrueHD.