Hi
I have the same laptop and reinstalled the OS the day I got it and the mic driver was built in with the audio driver , I downloaded from Asus.
Has the speaker vibration pissed you off yet?
4 GHz 4790K i7@ 4.6GHz (1.18v) , 16GB DDR3 1866 MHz Dominator GT , Asus Maximus VI Formula Motherboard , Cosair GT 240 GB ( Boot )
Obsidian Series 650D Mid-Tower Case , Asus GTX 680, LG Blu -Ray combo , Cosair HX 1000 PSU , Custom water loop.( EK and Rasa )