Voyetra Turtle Beach Riviera Sound Card

I purchased this card for the purpose of passing through Dolby Digital from my Home Theater PC to my external Sony amplifier. I could never get anything but 2 channel stereo to work. I spent weeks trying different decoders and software to get it to work. This card is an OEM product. Although not stated, there is no warranty and it is not supported by Turtle Beach. I eventually learned the card by design DOES NOT pass through Dolby Digital as advertised but instead down converts it to 2 channel PCM.

I replaced the card with a different brand and it worked immediately without any effort other than selecting S/PDIF output.