Best Audio setup

Hello everyone. I am not an audiophile and so my knowledge on this is a bit limited, but I know a lot about computer parts in general.

I am getting a Turtle Beach x41 wireless gaming headset as part of a deal. I plan to use it with my PC and with my Xbox 360.

I know that the Turtle Beach x41 has a DSP inside to create sounds. I plan to connect it to my motherboard by S/PDIF cable. However, I was wondering if adding a decent sound card with S/PDIF capabilities would improve the sound quality more? From what I think I have figured out, but could be wrong, the S/PDIF just carries the information for the sound to the external device for decoding, and does not actually get decoded by the sound card.

Is this true? If so will my audio quality coming off of my motherboard's S/PDIF be just as good as that coming off of a sound card?

Thanks for any information.
 
Solution
If your tsaying digital and the headphone has it's own amp which I would assume it would for the type of setup it is, then yes, it won't matter. It's just a digital signal that doesn't even have to be converted to analog by a sound card, just straight digital from the game to the headphones. A sound card won't make a lick of difference unless you're a super audiophile trying to find the difference on $20,000 speakers.
If your tsaying digital and the headphone has it's own amp which I would assume it would for the type of setup it is, then yes, it won't matter. It's just a digital signal that doesn't even have to be converted to analog by a sound card, just straight digital from the game to the headphones. A sound card won't make a lick of difference unless you're a super audiophile trying to find the difference on $20,000 speakers.
 
Solution
That's what I thought. The headphones sold for like originally $160 and they have an amp and a digital signal processor and a lot of other goodies. I didn't think that the sound card would add anything extra to it, but wanted to make sure. Audio equipment has never been my strong suit.

Thanks getochkn.