Proximity effect is the effect of using near sound technology to boost bass, that is, the microphone is placed a few centimeters away from the sound source. Although in some situations this effect can produce a strong and full sound that some singers like, there are many situations where bass boost must be controlled or avoided altogether, for example, when recording conversations. The proximity effect may make the conversation incomprehensible. Some microphones are equipped with a bass filter to compensate for the proximity effect, and used in home recording to avoid low-frequency noise from electrical appliances such as solar tube transformers, refrigerators, and air conditioners.
⑤Overload sound pressure is very important for condenser microphones. The condenser microphone works in a linear state up to a certain sound pressure level (SPL). This SPL is called overload or maximum SPL, and the frequency is usually 1kHz. If the sound pressure exceeds this value, the output signal will deteriorate due to harmonic distortion. At the maximum SPL, the total harmonic distortion coefficient should not exceed 0.5% or 1%. It is impossible to overload dynamic microphones in normal applications, and they will never actually distort the signal. Sensitivity is the microphone output voltage under a certain SPL. It is generally measured at 1kHz and the unit is V/Pa or dBV. At a certain gain setting, the more sensitive microphone produces louder sound, but the user should use it carefully at this time because the risk of feedback also increases proportionally.
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