Playstation 3 into SB PCI-Express, cant get to work

Hello, I currently bought a sound blaster pci express. I am trying to plug in my playstation 3 into it using an 2 to 1 audio convertoer (both red/white going into 1) which I am putting into the audio in on the sound card.

I set the PS3 to register that audio but I cannot hear anything.

I am currently running vista.

In the control panel -> sound you can see the volume levels reading from the audio in of the ps3 but I cannot hear them on my speakers.

Thanks for your help!