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Parametric EQ's offer up to three control knobs per band gain (which is known as cut in its negative stages), centre frequency, and bandwidth or Q which determines how far around the centre frequency the gain control is effective. There are a number of different EQ types, but mixers invariably offer some kind of parametric EQ on the channel strips, and sometimes a graphic EQ on the master section. Although the term was originally intended to describe the correction or equalisation of a sound, it is now just as often used as a way of enhancing a signal. EQ (Equalisation)ĮQ is used to boost or cut specific frequencies of a sound. Even budget models will usually have reasonable metering on the master section, and this can be pressed into use for individual channels by using PFL (see below).
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Correct adjustment of the gain control is normally assisted by some form of visual metering, from a single clip LED on budget models, to full LED bargraph displays or VU meters at the top of the range. Signals which are weak at this point will need boosting further down the audio path, which will then increase noise levels. Careful adjustment needs to be made to ensure that the signal is not too hot which can result in distortion from clipping or overloading the channel, and also that it is not so low as to give a poor signal to noise ratio.
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Gain is also sometimes referred to as 'trim', as it is the control used to adjust the input signal to the correct level for the rest of the mixer's circuitry. The gain control or 'pot'(short for 'potentiometer') can normally be found at the top of the channel strip near the input connector.