Review on Devinal 1/8 inch Male Stereo to Dual 1/4 Mono Male Audio Cable, 3.5mm TRS to Dual 6.35mm TS Y Splitter Breakout Cord, 15 Feet Gold Plated Heavy Duty Durable - Perfect for Music Production and Recording by Shawn Parker

The description makes no disclaimer that this *doesn't* work for a 3/8" mic that plugs into two 1/4" mics ". TRS inputs, although everything is perfectly matched. The 3/8 mic has an incompatible voltage with 1/4" TRS (for example, 1/4" TRS or XLR usually include 48V Phantom power). Without the right power supply (3-5V from phone, PC, etc.) the 3/8 microphone will not work. ) is a "VXLR" or similar adapter that solves the power supply problem between 3/8" and 1/4" loosens. You can then use a 1/4" XLR adapter.