So I did a little experiment to test the microphones:
- Internal microphone alone - Sensitivity is weak from a normal driving position. Sound quality improves greatly when speaking 2-3 inches away from the microphone.
- External microphone attached - Sensitivity is still weak from a normal driving position. I mounted the mic on the steering wheel in front of the dash gauges. Sound quality does not improve when speaking directly (2-3 inches away) in to the microphone. However, if I lean over and speak in to the internal mic, sound quality improves greatly. I am not sure if this external mic is working at all.
- 3rd part external mic attached - I substituted the external mic from Eonon with a Parrot Bluetooth mic I happened to have. Sensitivity is still weak from a normal driving position. However, when I speak directly in to the Parrot mic, sound quality improves greatly.