The AVR-3806, an upgrade from the best-selling AVR-3805, continues to offer the finest in multi-channel audio performance and ensures ultra-rigorous standards of signal purity. Key new high-end features include HDMI switching, 7 channel amplifiers, HDCD decoding, built-in XM-satellite radio capability, and multi-zone functionality. The AVR-3806 also incorporates Audyssey MultEQxt Room EQ to calibrate your audio system and is packaged with a microphone to make your set-up even easier.