MacBook Pro traditionally have the microphone placed at two distinct locations. The MacBook Pro 15u233 with space for the speaker grid on both sides usually have the microphone positioned under the left speaker grid. The MacBook Pro 13u233 (before the 217 model) with more limited space so no speaker grids has the microphone positioned on the left bottom part above the ESC key on a very delicate grid of mini-holes. The MacBook Pro 13u233 (current model) has speaker grids and usually have the 3 microphone array positioned under that area. And for information only the MacBook Air has it on its side. The 212 model one mic and the 213 two mics. It is a very interesting question and my first natural assumption was that the microphones would be located on the display hazel at the top part close to the camera wrooonngggg -) Best regards Leonardo