Miles Walker December 28, 2010 at 11:47 am Thanks for the question freldniy guy. Choosing a different sized diaphragm mic can have a lot to do with what you are recording. While there is no right/wrong choice, what mic I pic is usually based on how it’s going to compliment the sound. If we are talking about recording vocals, the size of the diaphragm can shape the frequency response in a way the that is helpful to the vocal sound I’m going for. For instance, if you were to look at the Neumann U87 and the U89 (which is a smaller diaphragm), the 89 has a slightly flatter frequency response and therefore, could be a better choice if I’m looking for less coloring of the vocal. There are also other factors that make that mic that way (as compared to the U87), but basically when looking at my choice of diaphragm selection it’s mostly based off of frequency response.