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When there is no power to the unit, the equalizer automatically reverts to bypass. 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. 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 range selected. When all of the sliders are in center detented 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) 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. 8A. Low-Pass Filter Switch and Indicator (GEQ 215/215LF) 16KHz, 12 dB/octave LPF. LED lights when activated. FRONT PANEL CONTROLS AND CONNECTIONS GEQ 131/131LF Single Channel 31 Band Graphic Equalizers GEQ 215/215LF 2 Channel 15 Band Graphic Equalizers GEQ 231 2 Channel 31 Band Graphic Equalizer 7 2 3 8 6 5 1 4 6 POWER +12 10 +6 -6 +3 -3 0 -12 0 LEVEL 5 31 BAND GRAPHIC EQUALIZER GEQ 131LF OFF ON BYPASS CLIP –6 –12 RANGE 40 15 60 10 250 HI PASS 15K 7K 22K 3K 50K LOW PASS 20 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 7 7 7 2 6 5 4 2 3 8 6 5 4 1 3A 8A 7 2 5 6 4 1 7 2 5 4 6 7 2 5 4 6 3A 8A 1 3 8 6 4 2 5 1 REAR PANEL CONTROLS AND CONNECTIONS GEQ 131/131LF Single Channel 31 Band Graphic Equalizers GEQ 215/215LF 2 Channel 15 Band Graphic Equalizers 11 9 11 GEQ 231 2 Channel 31 Band Graphic Equalizer 9. IEC Power Cord Receptacle This is used to connect the AC power source to your equalizer. Power requirements: 115/230VAC, 50/60Hz 10. AC Voltage Selector Set this slide switch to match your line voltage supply. CAUTION: For new installations and portable sound systems, or in any situation in which the AC power is suspect, it is wise to confirm appropriate voltage and line polarity BEFORE connecting the instrument to the power source. 11. Fuse Holder This fuse holder contains an AC primary fuse. This fuse should be replaced with the same type fuse when this is blown out. If they continuously blow, stop replacing the fuse and refer servicing to qualified personnel. CAUTION: After checking the AC supply voltage, be sure that the correct fuse is in the fuse holder: 0.5 Amp for 100-130VAC and for 220-240V AC. 12. Ground-Lift Switch This switch is used to disconnect the signal ground from the AC power and chassis earth ground. This switch should be put in the LIFT position if the speakers produce humming sounds caused by a ground loop. 9 10 1211 13 9 10 13 12 10 1313 12 13 13 9 10 1211 13 9 10 1211 13. Input/Output Connectors See INPUT/OUTPUT CONNECTIONS section (page 2) for proper wiring of the XLR, 1/4" TRS and RCA connectors for desired active balanced or unbalanced operation. Paralleling inputs and outputs may be accomplished by using any of the 3 connectors. Note: The 1/4" TRS connectors are normally used for this function. Note: while you can use any input connector with any output connector, only one of these connectors is to be used at a time. TYPICAL SETUP NADY AUDIO graphic equalizers may be used wherever modification of the frequency contour of a sound system is needed. A graphic equalizer is a solution to any number of sound problems or creative urges. Sound Reinforcement Applications By routing the signal from the mixer to the main power amplifiers (or crossover), the overall frequency of the mix may be altered to do a number of things. A. Through the use of a real-time audio spectrum analyzer, a calibrated microphone, and a pink noise source, the audio system may be "TUNED" to make the overall audio spectrum response of the audio reinforcement system and the room environment flatter in its frequency response. B. By turning up the audio reinforcement system to the feedback point, then attenuating the oscillating frequency (1/3 octave resolution), then turning the system up to attenuate the 2nd oscillating frequency, and then the 3rd, and so on, you can enable the entire audio system to have much more gain before feedback. C. Amplifiers and speakers may be protected by the use of the LOW CUT feature of the equalizer. Wind noise or the loud percussive sound of dropped microphones, etc., could potentially cause damage...

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