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PRESONUS
17
3.1 EQ3B FRONT PANEL BASIC LAYOUT
The front panel on the EQ3B is divided into three sections. These
are the three bands of equalization:
There is a frequency selection knob (Hz), gain/gain reduction(dB)
(amplitude) knob and a Q control. The frequency selection knob
(Hz) allows the user to choose the center frequency of that band of
the EQ. The Q knob allows the user to alter the width of the
frequency being adjusted. Q is defined as the ratio of the center
frequency divided by bandwidth. An example of how the width
looks can be seen below in Figure 1. An example of use of high Q
would be a “Notch Filter”. A Notch Filter is used to remove a small
frequency range that may be annoying or unwanted. An example
of wide width or low Q would be a bell. An example of using a bell
would be a low end roll off. Let’s say that a person is performing
live and the low end is too overpowering. The engineer or sound
person could set the Q at 0.1, frequency at 80Hz and the gain
reduction to -12. This would enable that person to lower a wide
frequency range fairly quickly. The Gain/Gain Reduction knob (dB)
allows the user to raise or lower the amplitude (peak) of the chosen
frequency.