I have a ATV with updated software. It is outputting via HDMI to a RadianceXD scaler which is then sending coax digital signal to a Lexicon MC1 processor. The lexicon front panel states what signal it's getting, and I'm getting nothing other than prologic. I've enabled dolby digital in the ATV menu. I -think- the problem is my handbrake encoding perhaps. If I command-I a movie within itunes under summary it says channels "stereo". When ripping in handbrake however I'm using "AVC/H.264Video/AAC + AC3 audio" which should be giving me AC3, right? I tried some HD trailers and didn't get digital there either, just DPL. Do apple's trailers play in AC3/5.1? If they do, then I've got a problem upstream from my ATV likely. Hopefully that's not too confusing - hope someone can help because although I'm happy with the video quality (especially with the radiance scaler!) not having digital sound bites!