开云体育

In a reply to the thread titled "Top secret Earthworks M50 capsule..." I suggested that the low frequency response of?an omnidirectional microphone can be tested by placing the microphone can be tested by placing the microphone inside a small enclosure. It may not be immediately obvious?but the pressure inside a sealed loudspeaker enclosure is very uniform at frequencies below the loudspeaker resonance.When I say uniform, I mean that it is flat from the resonant frequency down to DC. The practical low frequency limit is determined by the time constant of any leaks. The surround of the woofer needs to be rubber. Cloth surrounds leak. Such a test enclosure can also be used to test the distortion and overload performance of microphones because such a system is extremely efficient.