Dynamic Microphones - For Rock Recording Studios

By Marilyn Moody

This blog post features a summary in relation to various necessary standards which happen to be frequently posted in microphone specification pages: frequency response, sensitivity, impedance, self noise level, and signal to noise ratio. Understanding such specs should help whenever attempting to choose the correct dynamic microphones to get hold of with regard to a special application.

Frequency response calculates how a microphone takes action to a range of sound wavelengths. A superb "flat" response (identical sensitivity) microphone should respond the same to all frequencies throughout the perceptible spectrum. This causes a a great deal more complete reproduction of sound and provides the finest audio.

The truthfulness is that even mics which have been promoted as having a "flat response" may deviate just a little at certain frequencies. Often, spec sheets definitely will list frequency response as a level like "20Hz to 20kHz", meaning that the microphone has the potential to reproduce sounds which settle among that scale. Something that this does not explain is how appropriately the different individual wavelengths shall be reproduced.

A handful of mics may be deliberately produced to behave distinctly to specific wavelengths. As an example, instrument mics intended for bass drums will be created for being way more responsive to lower frequencies when voice microphones would definitely be somewhat more receptive to the frequency of a person's voice.

As a traditional rule of thumb, condenser mics carry flatter frequency responses as compared with dynamic. This ensures that a condenser will turn out to be the better preference when perfection of audio reproduction is going to be main aim.

Self noise is the electrical hiss that a microphone produces. Mainly the self noise spec is "A weighted", meaning that the minimum and highest wavelengths are really flattened in the response curve, to better recreate the signal response of the human ear. For a common rule, an A Weighted self noise specification of 18dB SPL or lower is superb (exceedingly quiet), 28dB SPL is nice, and everything beyond 35db SPL will never be appropriate for quality music recordings.

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