Instruct: Classify Amazon reviews into positive or negative sentiment
Query: No 5.1 Through Optical/Tos-Link

While the stereo sound that comes through this card is crisp, the 5.1 channel sound only plays through the analog ports. So while technically it is a 5.1 channel card and there is audio output through the optical port, you can't play 5.1 channel sound through the optical port.The card's manual demonstrates some questionable business practices on the part of Dynex. It says that you should return your card to the place of purchase if it breaks within the 1-year warranty. (This is, of course, impossible.) It also says that you should make sure your sound system not only has an optical port, but that the sound system's manual specifies compatibility with the exact model number of Dynex card. This is ridiculous, and in any case it should have been printed as a system requirement on the box rather than hidden in the manual.