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ah - gotcha. Thanks. That may explain why things weren't working as expected - eg I'd at least have expected phantom power to blow out the plugin-power microphone. :) ....but not if it's actually line-level. Makes more sense that way.

There is a port that takes XLR -or- 1/4". I found some information that helped. The ambient mics use 'plug-in' power, which is about 5 volts. (XLR uses 48V phantom power.) So I had to buy an adaptor that not only changed 3.5mm to XLR, but also converts 48V to 5V. (Not sure if I can DIY-make...

The mixer takes a 1/4" mic or a XLR input. So I'm using a stereo>mono 1/8">1/4" converter. (Headphone converter.) Convoluted? Yes!

OR .. (maybe?) tell me how phantom power works -- maybe I need to understand how to send the power to the mic through a 3.5mm plug. What's the proper wiring/ pin configuration?

I'm trying to help a nonprofit put together a meeting conferencing system on the (VERY) cheap. Essentially Zoom + omnidirectional ambient microphones distributed throughout the room. So - I have a 4-mic mixer (with phantom power) that hooks up to a laptop via USB. In principle, this should do...