You would be better off to use a small mixer with separate channels/preamps, preferably xlr inputs, and run it through your aux. input... This would give you individual control over levels/EQs.
(unless it's for talkover purposes only -then your Y splitter should do the trick)
I use a little behringer UB1202 w/ 3 shure sm58 mics and it gets the job done for small hip-hop shows: www.amazon.com
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