I'm pretty deep into debugging this. I suspect there's just some knowledge I'm missing.
The lav mic is a stereo 3.5mm TRS male from a wireless lav kit CVM-WM300. This mic is working for sure as I happily connect it directly to my computer. I connect the lav, without the wireless system, to either:
- DISINO 1/8 to XLR Male, to Balanced 3.5mm Female Stereo TRS Mini Jack
- COLICOLY XLR Male Balanced to 3.5mm Female Audio Converter Cable Adapter
Which plugs into the XLR inputs on the back of the Zoom PodTrak P4. I just hear noise. No signal from the mic.
I bought a multimeter and started measuring to see if the pins on the adapters are wired correctly. They do seem to be wired correctly per the diagrams I found. I measured the DC resistance on my Shure SM-57 to be 17 ohm, and the resistance on this Lav mic is 1 ohm. That's the same resistance I measure between the hot and cold signals on the XLR end of the adapter.
Everywhere I read that microphone's impedance should be in the 100-600 ohm. Which is nowhere near what I'm measuring.
So the question really is - is this 1 ohm completely wrong because it's a DC measurement? Is 1 ohm just so low impedance that the mixer can't handle it? Is there another reason that this lav mic is not working at all with the Zoom P4? Do I need another component to make them compatible?