My wife’s computer (which is now our DVR system) has a (Dell OEM version of the) Sound Blaster Audigy 2 ZS, which includes a port labeled “Digital Out”. I wanted to connect it to the surround sound system I have, which only has a single digital input, labeled “Digital Coax”. I thought that I might need to get the Digital I/O Module and a digital coax cable, but I wasn’t sure that would work, since the sound card model isn’t explicitly listed there, although I suspect that it would. The digital out itself is kind of odd, since it’s really three separate stereo SPDIF outputs, to get 6 channels out, and the sound card didn’t support the normal AC3 encoding over one output to a receiver, although it could pass through an original AC3 source (like a DVD, or, I hoped, a HD recording) on one channel.