User manual Nady Systems GEQ 231

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FRONT PANEL CONTROLS AND CONNECTIONS  
GEQ 131/131LF  
Single Channel 31 Band Graphic Equalizers  
6
4
7
2
3
8
5
1
2
0
25  
31.5  
40  
50  
63  
80  
100  
125  
160  
200  
250  
315  
400  
500  
630  
800  
1K 1.25K 1.6K 2K 2.5K 3.15K 4K  
5K 6.3K  
8K  
10K 12.5K 16K 20K  
+
12  
10  
+
6
3
+
3G1 BEANDQGRAP1HI3C E1QULALIZFER  
0
5
-
-
3
6
15  
40  
60 7K 15K  
22K BYPASS RANGE  
ON  
OFF  
10  
250 3K  
50K  
POWER  
-
12  
0
HI PASS  
LOW PASS  
CLIP  
–6 –12  
LEVEL  
6
4
2
3
8
7
5
1
GEQ 215/215LF  
2 Channel 15 Band Graphic Equalizers  
6
4
6
4
1
7
2
7
2
5
5
5
4
5
4
1
7
2
7
2
6
6
3
A
8A  
3A 8A  
GEQ 231  
2
Channel 31 Band Graphic Equalizer  
6 5 4  
1
3
8
7
2
1.  
Power Switch  
To turn the equalizer ON or OFF, press the upper or lower  
portion of this button.  
CAUTION: Always turn on your equalizer BEFORE your  
power amplifiers are turned on, and always turn off your  
equalizer AFTER your power amplifiers have been turned  
off.  
5. In/Out Bypass Switch & Indicator  
This switch inserts or removes the equalizer channel from the  
signal path. The red LED lights when the switch is depressed to  
indicate that the unit or channel is in the equalizing mode. In the  
bypass mode, the signal is routed from the input directly to the  
output. The bypass function is FET switched to prevent switching  
transients when inserting the equalizer into the circuit path. Use  
this switch to compare equalized and unequalized material. When  
there is no power to the unit, the equalizer automatically reverts  
to bypass.  
2.  
Input Level Control  
This controls the level of signal to the equalizer. It is capable  
of +/- 6dB of gain.  
This control is used to adjust for variation in input level to the  
equalizer channel, or to compensate for the equalization  
applied to the input signal. Turn this control down if the CLIP  
LED illuminates steady (meaning too strong an input signal).  
Unity gain can be set by turning this knob to its center detent  
position.  
6. Peak/Clip Indicator  
This red LED illuminates if any section of the equalizer is within  
5dB of clipping. Occasional blinking of this LED is acceptable,  
but if it remains on more than intermittently you should turn down  
either the equalizer’s level controls or reduce the output level of  
the preceding component to avoid audible distortion.  
3.  
Low-Cut/High-Pass Filter (GEQ 131/131LF/231)  
These equalizers are equipped with a 10Hz, 12dB/octave,  
variable Low Cut/High-Pass Filter (HPF) to cut down unwanted  
low frequency signal. Because of its high roll-off slope, the HPF  
7. Filter Level Slider Controls  
Each one of these linear potentiometers will boost or cut its noted  
frequency by either +/-6dB or +/-12dB depending on the filter  
can be efficiently used to attenuate the "HUM" noise from preced- range selected. When all of the sliders are in center detented  
ing instruments, or to prevent the low frequency resonance that  
can occur when speakers are installed in an enclosed acoustic  
environment.  
position, the output of the equalizer is flat. Each slider is marked  
with the center frequency of its band pass filter.  
8.  
Low-Pass/High-Cut Filter (GEQ 131/131LF/231)  
3
A. High-pass Filter Switch and Indicator (GEQ 215/215LF)  
This filter rolls off higher frequencies. This is useful for reducing  
hiss or sibilance from a signal. Its range is adjustable from 3KHz  
to 50KHz.from 3KHz to 50KHz.  
40 Hz, 12dB/octave HPF. LED lights when activated.  
4.  
Filter Range Switch & Indicators  
The gain range of the filter sliders is switchable (as a group) from  
8A. Low-Pass Filter Switch and Indicator (GEQ 215/215LF)  
+/-6dB to +/-12dB for maximum boost/cut capability. At 6dB the  
16KHz, 12 dB/octave LPF. LED lights when activated.  
green LED will illuminate and at 12 dB the red LED will illuminate.  
6

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