Ashly GQX-3102, GQX-3101, GQX-1502 manual Controls, Typical Applications

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

GQX Series

Model 3101

Third Octave

Graphic Equalizer

20 25 31.5 40 50 63 80 100 125 160 200 250 315 400 500

Power

5.CONTROLS

5.1Gain

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 -∞.

5.2High-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.

5.3Equalization

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.

5.4EQ 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.

5.5Range 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.

5.6Level 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.

6.TYPICAL APPLICATIONS

6.1General 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:

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