DESC: The Denon AVR2309CI is equipped with the high resolution surround sound format decoding capabilities, including Dolby TrueHD, Dolby Digital Plus, and DTS-HD Master Audio - the high resolution audio formats found on many Blu-ray high definition discs. The powerful seven channel amplifier section can be configured for 7.1 channel surround sound, as well as being able to drive a 5.1 channel system in the main room along with powered stereo speaker outputs for second zone audio.