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My roomie has two computers that he needs to connect to his Logitech 5.1 system. Using an optical cable for one computer didn't work properly, and also doesn't permit simultaneous listening.

eBay offered no relevant results for "5.1 mixer", so I'm planning a little electronics project: a board with 12 inputs, 6 outputs and 18 op amps to mix down two analog 5.1 signals into one .

This is such a common need for hard-core gamers that there really should be a shrink-wrapped product for it.