Ashly GQX-3101 Manuel d'utilisation - Page 6

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Operating Manual - GQX 3102, GQX 3101, and GQX 1502 Graphic Equalizer

GQX Series

Model 3101

Third Octave

Graphic Equalizer

CONTROLS

5.1

Gain

The gain control adjusts the overall gain of the

equalizer when the EQ switch is "in". It is generally used

to compensate for level changes due to the equalization

process, but can also allow the equalizer to adjust overall

system level and gain structure. Overall gain with this

control is from +6dB to -

5.2

High-Pass Filter

The high-pass filter can be used to supplement

the frequency response achieved by the bandpass filters.

It's function is to "roll off" the response below a given

frequency to eliminate subsonic interference like wind

noise, floor rumble, and microphone "pops". The rolloff

frequency is adjustable between 14Hz and 280Hz on the

31-band models, and is fixed at 40Hz on the 15-band

model.

5.3

Equalization

The individual equalization faders adjust the gain

or loss at each filter frequency. There are 31 of these fad-

ers per channel on the GQX-3101 and GQX-3102 third

octave models, and 15 faders per channel on the GQX-

1502 two-thirds octave model. By adjusting a combina-

tion of faders, an overall frequency response can be

developed and the physical position of the faders will give

an approximate visual indication of this response.

Power

31.5

5.4

EQ Bypass Switch

This switches the Graphic Equalization and gain

adjustments. This way, the effect of any equalization can

be compared to a "flat" response. This switch does not

defeat the High-pass filter.

5.5

Range Switch

This switch selects the operating range of the in-

dividual equalization faders between 15dB and 6dB on

the two 31 band models. The 15dB settings should be

used when this much equalization is needed. The 6dB

setting allows finer resolution on the fader settings.

5.6

Level Meters

On the GQX-3101 and GQX-3102 31 band mod-

els, a 10-segment, two color LED level meter indicates

the output level of the equalizer. A Clip indicator LED on

all models illuminates when any point in the equalizer sig-

nal path reaches a level within 3dB of clipping.

TYPICAL APPLICATIONS

6.1

General Tone Control

The graphic equalizer is a very useful device for

general tone shaping because it is intuitive and easy to

adjust. The visual reference provided by the slider posi-

tion gives an approximate idea of the frequency response

generated, with the lower frequencies on the left and higher

frequencies on the right. To use the power of an equalizer

effectively, you need to translate your idea of the tone you

want to produce into a range of numerical frequencies.

This is simple after a little practise. Here are a few refer-

ences which are useful for starting points:

100

125

160

200

250

315

400

500