Connecting Audigy 2 to Creative GD580

I have a Creative Audigy 2 sound card, a Creative Inspire GD580 speaker system and I'm trying to link the two through the coax input on the GD580 and ideally the digital out on the Audigy 2, but am unable to find anyone that can supply the leads to do the job. The GD580 has two RCA inputs, but I'm using these to handle the sound from my Xbox 360.

Creative themselves suggest using a 3.5mm jack to 5 Pin DIN converter, then DIN to coax, but despite my best efforts, I can't find anyone that can supply such a thing.

I can't believe that this is that uncommon a configuration, would be interested if anyone has a similar setup, what leads they're using and if possible where I can get them from!

 

OK.. just been doing a little more google'age and research.

The Audigy 2 digital out is a 4 pole SPDIF 3.5mm mini jack. Also reading around it appears that a simple mono jack to RCA lead will do the job? Is this right? If it is I can't believe 3 shops and the Creative website have tried to make it so complicated!