The 722 and 722k have a few issues with audio via HDMI, but it's supposed to work just fine. I think the note in the manual is mostly talking about people using HDMI-to-DVI adapter cables, and DVI doesn't do audio. Try it, but it should just work. If it doesn't work, some Cheap-O RCA cables come in the 722K box, and they'll get you by until you can get real cables or a digital audio cable.