The Pioneer VSX-515 is a 7.1 channel audio/video receiver that supports various surround sound formats, including Dolby Digital and DTS. It features several audio inputs and outputs, as well as built-in decoders for enhanced audio processing. The receiver is equipped with a variety of connectivity options, including HDMI, optical, and coaxial inputs, allowing it to connect with multiple audio and video sources. The VSX-515 is designed for both home theater and music listening, providing a range of customizable audio settings to tailor the sound output to a user's preference.