Hello sxe,
I don't have a Sakura amp nor a sound blaster audigy sound card.
But my pc has a dvdrom. It also has a sound card that can be set up to output 5.1. When configured for 5.1, front L/R comes out of the speaker out, surround L/R comes out of the line out and and center/sub comes out of the mic socket.
It was unwieldy but it worked. Here's what I did:
1. configured the sound card for 5.1
2. connected 3 stereo amps to 2 front speakers, 2 rear speakers, 1 center speaker and 1 passive diy sub
3. connected 3 ordinary pairs of rca wires between the 3 amps and the sound card - I had to use 3 of those little things that have an ordinary male stereo jack at one end and two female rca connectors at the other.
4. Popped in a dvd and after SEVERAL minutes tweaking THREE volume controls, THREE balance knobs and the pc volume, I enjoyed watching.
In short, pwede
Personally though, I would prefer not to watch using my pc dvd all the time.