There is more gain before feedback, significantly less leakage from surrounding instruments and the same pristine sound quality with the piano lid either up or down. At the heart of the system are two Random Incidence, omnidirectional, 40 kHz High Definition Microphones™. With a frequency response of 9 Hz to 40 kHz, the mics deliver extraordinary impulse response and extremely short diaphragm setting times. In addition, the microphones exhibit no proximity effect, regardless of their distance from the piano strings or soundboard. The mics, when positioned close to the sound source, also provide incredible gain before feedback.