Last Saturday I installed SonyEricsson HCB-30 bluetooth handsfree. I got 04 S model, no sunroof, and I do have that little oval plastic cover for factory mic.
So I installed mic there, pointing of course down (velcro-ed on the sides to sides of oval plastic cover).
While the clarity and volume of my voice is adequate when car is still or slow speed, it's practically unusable if driving at interstate speeds (55MPH+). To be more specific, my voice get "hidden" by road noise. I had to shout for the other side to hear me.
So, anyone has other ideas for mic mounting? Maybe mount it outside the plastic cover? Maybe in A-pillar?