It's a bit difficult to understand what you mean, but I'll try to guess.

Your Auriga 5.1 Surround Sound speaker system has a 9-pin connector which your Creative Soundblaster Audigy 2 does not? If you are able to connect the 3 * 3.5mm stereo phono jacks, representing the 6 channels necessary for 5.1 Surround Sound, then any additional connections are unnecessary.

If this is not the case, you may be looking at a mini-din, which should come with an adapter with either 3 * 3.5mm jacks, or 3 * RCA. If you have RCA on the end of the adapter (single middle pin with round outer shield), then you'll need 3.5mm jack to RCA adaptors as well.