User's Manual

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Multiple

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Overview

2 Controls & Connections

2.10 Digital Effects | Master Control

2.10.4 The System Menu

In an analog EQ, this is achieved by carefully choosing the bandwidth of the lter and deciding how or if it

varies with the gain and how the lters are summed or cascaded. In general, narrower bandwidth signies a

higher quality EQ. But in traditional graphic EQ designs, the center frequency of each band is xed.

PreSonus took a different approach with the StudioLive. The StudioLive Graphic EQ is a pool of shelving

lters from which coefcients like cutoff frequency, bandwidth, and gain are extracted through a process of

curve tting. The curve entered by the user is rst oversampled. The system then works with an internal

curve made up of 128 bands to nd coefcients for the rst shelving lter that, when subtracted from the

user’s curve, will produce the attest possible response: 0 dB. The resulting response is then used to

nd coefcients for the second shelving lter through the same optimization process. Coefcients for all

available shelving lters are found through a recursive process.

Unlike conventional designs, the frequency and bandwidth of the “bands” depends on the curve entered

by the user. This allows for much tighter matching of that curve. Because of this innovative design, the

accuracy of the StudioLive EQ might feel “wrong” at rst. The curve tting process is capable of very steep

transitions and, unlike conventional analog graphic EQs, what you see is what you get. With a carefully

drawn, smooth curve the StudioLive EQ will have almost no frequency ripple. The StudioLive EQ is also

capable of very sharp notches. To widen a notch or a bump on a particular band, just bring the adjacent

bands closer to that band‘s gain and the bandwidth will change accordingly.

Press the Page Down button to view the rmware version

currently loaded on your StudioLive. You normally will

only view this screen when performing a system update,

in order to conrm that the new rmware was successfully

loaded.