Here’s a summary of the VSX-520-K’s features:
110 Watts output for each of the 5 channels
HDMI ver 1.4a with Audio Return Channel (ARC) for 3D video playback.
Supports high-definition lossless audio formats like Dolby TrueHD and DTS-HD Master Audio.
Dolby Pro Logic IIz adds front “height” channels for a more immersive experience.
Bluetooth Ready – you can add a Pioneer AS-BT100 Bluetooth adapter (sold separately) to release your music stored on your iPhone, Blackberry, or Android smartphone as well as other Bluetooth-enabled sources like laptops.
Advanced Sound Retriever (AIR) enhances audio playback of compressed audio such as WMA, MP3 and AAC to near CD quality sound. This technology also enhances the audio quality of SIRIUS Satellite Radio and can realize an upper limit frequency of 20kHz with compressed audio playback for surprising audio richness and clarity even from “lossy” digital audio sources.
Auto Level Control equalizes volume level differences between tracks playing from an iPhone or iPod or during television programming.