Yeti Blue Microphone versus Mac computer
I too had this problem till In saw a video. The audio on the youtube video was somewhat low but I saw the fellow switch the cable. So I had to search for a smaller length cable and voila it worked. My theory is the cable is too long for the 2012 iMac I have. I also have an Mac mini 2012 and a MacBook Pro 2012 and an HP Folio that I have not tested. I see other have had this problem. Look for a shorter USB cable.
Lou Cioccio