HD-DVD/Blu-Ray is using a new audio codec, either DTS-HD or Dolby-HD; be sure you undersatnd that NO receiver can decode the new codec at this time, and ask if your new receiver will be able to in the future ( firmware upgrade). At CES last week, Marantz was furthest behind the 8-ball technology wise. Also, your receiver must have HDMI input and output capabilities. Good luck.