Chosen Solution

This might be a little weird, I’m trying to get pictures and specific idea of where the microphone is on this iMac. I’ve tried various sources it seem that almost no one is interested in the on-board input microphone I’m trying to see: Its route into the logic board or what have you?Where is it situated as apple support claim it to be beneath the apple logo but by the quality of recordings I’m not sure. As you can see I’m not very experienced at these things and it has been years since I used an iMac let alone looked at internals and would extremely appreciate any kind of help.

Apple does tend to hide it well! In this series the microphone is with the iSight camera logic. A small slit in the aluminum case and a channel created by the adhesive strips to the edge of the glass and case. You can see it here:

Actually this answer is incorrect. As of the 2017 model(so includes 2019 models), it’s as follows: The Isight camera is still located as mentioned at the top of the display. The microphone and cable are located at the bottom of the Imac, about 1/3rd from the right. It’s connected with a tiny flatcable to the logic board.

But has anyone encountered the muffled recording after reassembly making sure the adhesive tape is not covering the mic?

My iMac 2017 shows the microphone picks up if I tap on the computer but it does not pick up voices. I tried plugging in a usb mic as well as apple headphones with a mic and it does not pick up voices then either. Suggestions for repair. I am running latest operating system. Followed numerous suggestions about adjusting settings and nothing works.