The 1/4-inch mono/splitter will only work when using identical mics, and with the correct impedience. If they are low impedience mics, you could overload the mic input circuit. In most instances it's best to use an inexpensive mixer such as the Alesis Multi-Mix6-FX. Not only do you eliminate overload problems, but additionally, you can set the effects for each individual mic.

Good Luck,

Gary

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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)