If you only saw "PCM" in the 990's display, then your DVD player is still set to the (immensely annoying) default of "PCM" for DTS audio. Your DVD player must be configured to output DTS as a bitstream for a DTS soundtrack to work at all. That is necessary to allow the player to pass the original audio data (literally, the unaltered "stream of bits" coming from the disc) from the player to the receiver or processor. Unfortunately, DVD player manufacturers got into the habit of setting the default to PCM back when DTS decoders were almost unheard of (back in the late 90's) to prevent an undecodable bitstream from reaching the receiver and have only recently begun to start changing the default to bitstream.