Stereo to 5.1 Adapter Cable

Hi everyone,

so i wanted to buy a 5.1 pc sound system which unfortunately has 3 seperate stereo inputs to support 5.1.

As im going out of a mixer that does not have 5.1 outputs (just stereo) i was thinking about getting a bunch (4) of cinch splitter cables to get enough outputs. Would you think this works, or are you seeing any problems with that. I really dont wantt to buy a decoderstation or the logitech console adapter. 

I would be glad to get some help with this :D

EntroP