PRESONUS
3 . 1 E Q 3 B F R O N T P A N E L B A S I C L A Y O U T
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
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