Cambridge - Azur 551R (Black) 4 HDMI in, 1 out with support for 3D TV / Deep Color pass thru / Audio Return Channel reception Pure Analog Stereo Direct mode for audiophile playback of analog stereo sources Slim, aesthetic design - only 4.3'' tall Individual crossovers and Advanced Bass Management Bi-amp mode for front left/right with surround back left/right in 5.1 set-up