Audio-Technica demonstrates the basics for properly miking and recording an acoustic guitar, using the Audio-Technica AT4047/SV Condenser MicrophoneDefinition:
A microphone with a charged diaphragm over a stationary plate, with an internal amplifier that requires power (battery or phantom power). , AT4041 Condenser Microphone, AT4040 Condenser Microphone and AE5100 Condenser Microphone.