What is the best way to get 5.1 out of a PS3 without using a receiver? My current setup is:
PS3 <HDMI> Asus monitor

.5mm connector> PC line in <> PC output to speakers. This only gives me 2.0 output though, which sucks.
My computer has onboard 7.1, my speakers are a Logitech X540 set. I want to use able to use the digital audio out (from what I understand it's an optical connection?) from the PS3 and feed the sound to my speakers. I've found an audio card that has optical in but from what I understand those can have a lot of lag? I don't really need a whole new card, just optical in.
On the other end of things, I'm looking at the newer Logitech Z506 online, and it looks like it has an optical input? The specs don't mention it though. I don't like the look of the Z506 speakers as much but I guess I should he able to use the 540 speakers and just the Z506 sub, correct?