A condenser microphone requires its own power supply to function, and uses a capacitor to convert sound waves into electrical energy. There are many different types and sizes of condenser microphones available for audio professionals. A small diaphragm condenser microphone, also known as a pencil microphone or SDM, is the best choice for solid, wide frequency response in recording applications or live settings, mainly because it has a diaphragm that is a half-inch or less in diameter. In contrast, a medium diaphragm condenser microphone has a diaphragm that is sized between an SDM and an LDM, giving the medium diaphragm condenser mic a combination of the best qualities in functionality and form. ProAudio.com is home to many of the top brands offering excellent diaphragm condenser mics.