Just watched Serenity on a HD-A2 connected via optical to a Harman Kardon AVR635. I had to change the A2 to PCM as opposed to Bitstream because of an annoying echo whenever there was dialog. Doing this fixed the echo problem but the surround just didn't sound as good anymore. Is this normal?? I have the dynamic range set to off as well as the dialog enhancement. Is anyone else having this problem? I threw in King Kong as well and same issue but with a standard DVD, it sounds fine. I'm no expert by any means so any advice on things to try would be appreciated.