From what I understand, you won't get much better sound quality from purchasing a sound card, as the receivers will already do their own work. So, other than trying to split them up, I don't see why a sound card would be necessary.
I'm sure there is bound to be some kind of splitter than goes from the 3.5mm jack to multiple RCA cables, and if not, then maybe you can purchase 2 cables and work them out somehow. You can really do anything these days, so I'm sure it won't be much of an issue!
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