The Meridian microphone system has one serious advantage over an internal guitar mic. It is NOT inside the guitar. The true guitar sound logically happens outside the guitar body. Inside there are, aside from an excessive amount of bass frequencies, various sound reflections that do not represent the true tone of your instrument. An external mic captures the guitar sound as YOU hear it.
The mic is available with two different preamps as the Meridian Mic System or the Meridian Pro Mic System.