I have a samsung bd-2550 blu-ray player and it's hooked up to a pioneer vsx-1017 receiver which does not have the Dolby TrueHD or DTS HD ma decoders built in. I've been getting mixed answers dealing with the player actually decoding both formats and outputing it via TOSlink or whether it is only available through the 7.1 analog pre-outs (I tried the pre-outs aswell and they sound terrible). After reading some other threads it appears that it only will decode TrueHD and not DTS HD however I just got off the phone with Samsung's tech support and they said that this player has both decoders and they can be used with the optical out. Where I'm getting confused is how to actually get the player to decode those formats...tech support had trouble understanding my question so I took their info with a grain of salt. The manual says to use PCM if the receiver doesn't support TrueHD but when it's selected the receiver displays Dolby ProLogic and it doesn't sound like it's unsing the discrete channels. Is it supposed to do this? Also, bitstream (audiofile) sounds the best but the manual says that it won't decode TrueHD this way and tech support said I should try Bitstream (re-encode) instead but that just re-encodes to standard DTS. BTW the manual doesn't state at all that the player will decode DTS HD. I was wondering if anyone has any insight on this?..as to actually getting the player to decode? I know I gave alot of info but I didn't want to leave anything out, hopefully I wasn't too confusing. Any info would be greatly appreciated.