Hi @schep ,
Here’s an image of the phone layout taken from the user manual (go to Download manual) showing the speakerphone mic location.
(click on image to enlarge for better viewing)
Check that the voice inlet hole is not being obstructed by the case (it is is in one) or perhaps lint etc. Do not use a pin or probe to try and clear it as the microphone is directly behind it. Try using a vacuum cleaner instead to try and suck out any blockage.
If still no good here’s the ifixit Samsung Galaxy Note II Repair guides that will help to gain access to the upper mic so that it can be checked etc
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