Standard XLR. I tried two out of my master on the mixer and they were both good. The connection to the mic was good from what I could tell too, and the wires are soldered correctly in the mic.
Ok you had me confused with your first post. I thought you tried a second cord with the mic and it worked, but I see now you tried the cords with your speakers and they worked fine.
What were the terms on Amazon for the used mic? Was it “as is no returns”, or “30 day return”?
Ok, what mixer are you using? Were you definitely plugged into a mic socket? Some mixers have pad buttons, if yours does, this could be in place, meaning the preamp is getting -70db rather than the -40/50db its expecting…