Microphone Preamp

A microphone preamp or a microphone pre-amplifier is a device, which is used to amplify the voltage taken from a microphone to a higher level or a more usable level. Most microphones must be used in conjunction with a microphone preamp to function properly, as the voltage supply being taken from the microphone may not be giving the desired sound effects and thus spoiling the complete impact of the programme being listened to.  The sound engineering is not a simple task.  It involves multiple and complicated procedures.  Generally, the quality of the sound communicated through the microphones is quite different and lower than the original being produced from the original source. In such cases, while addressing the multitude of the people, the speaker may be losing all the impact of his speech, as the weaker and less impressive sound may not be hitting the hearts of the people in the desired manner. In such case, we cannot solely rely on the age old microphones, as these fail to communicate in hundred percent, what we aim to. Generally, the output voltage on a microphone is very low, which affects the sound effects so negatively that the audience or the listeners may not be enjoying the music or other sound items properly.  In such cases, we require the additional devices, which enhance the impact and the efficiency of the microphones. A microphone is the right choice for the users, as it increases that level by up to 70dB to a +4dB level output which is used by other external audio effects, for audio recording and for live sound etc. The circuitry inside the microphone preamp has a great effect on the sound of a microphone, from the way the microphone reacts due to impedance changes, to adding coloration from transformers or vacuum tubes or the valves, operational amps, transistors, and all the other circuitry used. The research over the decades has proven that the preamps do affect the sound performance to a considerable extent and thus support the sound producers, besides amusing the audience.  A microphone would simply prove ineffective and impotent, without the support of the preamps.  These preamps increase the impact of the sounds being communicated through the microphones.  Most audio engineers would assert that a microphone preamp affects the sound quality of a recording just as much as the microphone itself. Different combinations of microphones and preamps can achieve a wide range of tone, character and mood and thus these help in improving the sound effects to the maximum desirable level. Microphone preamps come in many shapes and sizes, and vary greatly in price from a few dollars to many thousands of dollars. Different brands of the microphone preamps are available in the market, out of which, a few are really famous and reliable in terms of quality, durability and the performance. The price range may also tend to vary, due to the brand name, performance or the quality. Many mixing boards or desks have microphone preamps built in. There are also a lot of external preamps from which to choose, which is great for adding the exact tone and feature set one needs for setup. Some preamps exist as one part of a channel strip, which can include other kinds of audio recording devices such as compressors, equalization (EQ), noise gates, and enhancers.