At the heart of the PianoMic™ System are two omnidirectional 40kHz High Definition Microphones with a frequency response from 9Hz to 40kHz, incredible impulse response and very short diaphragm settling time. When microphones are placed inside a piano they are within a sound field that has multiple sound sources: i.e. every string, the soundboard, multiple reflections of the sound from the sound board, the sides and the lid of the piano. All these sound sources and reflections produce sound waves that arrive at the microphones from all directions. This is called a diffused sound field, and the PianoMic™ is designed to perform optimally within such diffused sound field. In addition, these omni microphones have no proximity effect and the sound will remain the same no matter how close or how far the microphones are from the piano strings or sound board.