I've done some research and found similar questions asked beforehand, but have ended up confused by contradictory statements, so here goes: I have a DVD player connected to my audio amplifier via digital optical output (Toslink), and also a Boxee Box media streamer also connected to the amplifier by Toslink. (No HDMI as the amp is too old, but its sound stage is gorgeous and well matched with a high end speaker system so I have no intention of replacement) If I play A DVD with DTS soundtrack it is automatically detected as DTS by the amplifier, which then plays the sound track and displays DTS on its display instead of whatever format was displayed before playback started. The result is most certainly very surround sound to listen to, and when the DVD is stopped, the amplifier reverts to displaying whatever format was selected before. Perfect. Exactly what I would expect. If I convert the same DVD to .iso image using DVD Shrink and ONLY including DTS, when I stream the resultant image from my NAS via Boxee Box, the amplifier plays sound but it does not display DTS. I know that the image only contains DTS because if I stream it to my laptop, the audio is silent because the laptop has no DTS decoding capability. I don't get it! There is no LPCM 2 channel on the image, only DTS 5 channel, so how can the amplifier output sound but not show DTS on its display? DVD player connected to DTS certified amplifier via Toslink. Play a DTS encoded DVD. Observe correct DTS decoding as confirmed by the amp automatically switching to DTS. NAS connected to Boxee Box media streamer connected to DTS certified amplifier via Toslink. Using any software (DVD Shrink is one example) make a copy of the DVD to any format, being sure to only include DTS 5.1 and not PCM stereo. Play the copy on a laptop that doesn't support DTS. Observe no sound. Perfect - as expected. Stream the copy from the NAS to the DTS amplifier via Boxee Box and Toslink. Observe sound (which can only be DTS) - but the amp resolutely refuses to display "DTS" and the sound quality is thin with back-to-back comparison against the DVD. I do not therefore believe that the copy is DTS. Swapping the Toslink cables for Boxee Box and DVD player confirms that I do not have a hardware issue. edited by ddp Many thanks for explaining.