This Wikipedia article covers the basics. PS3s "downscale" the audio. A better option are universal players. Universal players play SACD, DVD-audio and DVD. About.com has a solid list of players but it's a little old. You'll want a player that supports HDMI v1.2 or later. It will output the full digital audio signal over an HDMI cable to a compatible AV receiver. The best universal player right now is the Oppo BDP-83 Blu-ray player for $500.