Nady Systems GEQ 131LF Stereo Equalizer User Manual
Contents
1. Ce se ele KAN GEQ 131 1311F Single Channel 31 Band Graphic Equalizer DUAL 15 GRAPHIC EQUALIZER C GEQ 215LF UAL 15 DUAL 1 GRAPHIC EQUALIZER GEQ 215 2191F 2 Channel 15 Band Graphic Equalizer GEQ 231 2 Channel 31 Band Graphic Equalizer OWNER S MANUAL GRAPHIC EQUALIZER SERIES NADY Congratulations Date of Purchase You have just purchased one of the finest graphic equalizers on the market today This EQ was devel Deal rs Name oped using the expertise of professional sound engi neers and working musicians You will find your new NADY AUDIO EQ has superior performance and City greater flexibility than any other graphic equalizer in its price range State Zip Read this manual carefully to get the most out of your Model new EQ Thanks for selecting NADY AUDIO for your choice in graphic equalizers Serial Contents FEATURES cm HQ INSTALLATION m Input Output CO MMOCTION Sc e tanta tab uta emet ba SK ti ea qe Gata Power Connection TE PISCAUTIONS e Signal Levels mee RC ER Chassis Grounding 52. XLA COMNECTION PIN 1 GROLIND FIH 1 GROUND noc ramer PFIN 7 HIGH PIN e pin 3 Low TIP HIGH EEE O GROUND oT ave DD TIP HGH 4 ii rira su ma meliore n SLEEVE Paralleling inputs and outputs may be accomplished by using any of the 3 connectors Note The 1 4 TRS are normally used for this function Power Connection Each of these five NADY AUDIO graphic equalizers is designed for operation from 120 240 volts 50 60 Hz AC supplies Power requirements for electrical equipment differ from area to area In new installa tions and portable sound systems or any situation in which the AC power is in question it is wise to confirm the voltage and select the appropriate line voltage switch before connecting the instrument to power sources Check to see that the unit is set to the voltage for your area by referring to the table below VOLTAGE SELECTOR Europe except UK 230V 50Hz UK and Australia 240V 50Hz 115V 230V USA and Canada 120V 60 Hz 120V 240V For other areas please check with local authorities If the voltage selector is not set for your area Confirm that the power cord is not plugged into a wall outlet Move the voltage selector switch with a small screwdriver so that the marker is set to the voltage for your area 4 Precautions Protecting yourself from electric shock Never touch th
3. 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 3 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 wit
4. Octave Bands Each Channel Long Throw Faders 60mm An equilateral triangle enclosing a lightening flash arrowhead symbol is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclo travel e GEQ 231 2 Channel Double Rack Space 31 1 3rd Octave Bands Each Channel Active balanced XLR and 1 4 TRS and unbalanced RCA input output connectors Constant Q bandwidth from each filter with a 396 center frequency accuracy Parallel filter design for minimal phase distortion Ultra low noise circuitry Variable low cut and low pass filters 12dB octave GEQ 131 131LF GEQ 231 switchable filters GEQ 215LF e Selectable range 6dB or 12dB Variable input level control Equalizer ON OFF bypass switch Peak overload threshold LED Internal power supply with AC input and selectable line voltage 110 240 VAC 50 60Hz Ground lift switch Power off automatic bypass function sure which may be of sufficient magnitude to constitute a risk of electric shock An equilateral triangle enclosing an exclamation point is intended to alert the user to the presence of important operating and service in structions in the literature enclosed with this unit INSTALLATION To ensure years of enjoyment from your NADY AU DIO graphic equalizer please read and understand this manual thoroughly before using the unit These five equalizer models are each designed for
5. mounting in a standard 19 equipment rack or one of the many rack type portable cases available on the market The units are either single rack 1 75 or double rack 3 5 as noted All five models are 8 66 inches deep Install the equalizer in a rack with the rack screws provided Route the A C power cord to a convenient power outlet away from audio lines The unit may be turned on and off from the front panel power switch or a master equipment power switch Since the unit draws a relatively small amount of current during idle the unit may be left on continuously NADY AUDIO equalizers do not generate an unduly large amount of heat and do not need to be specially ventilated or cooled The units should not be subjected however to high heat environments Although the unit s chassis is shielded against radio frequency RF and electromagnetic interference EMI extremely high fields of RF and EMI should be avoided Input Output Connections The 1 4 phone jack RCA jack and XLR connector inputs and outputs can be used for balanced and unbalanced connections CAUTION Using more than one connector at a time for the INPUT OUTPUT pair could unbalance balanced lines cause phase cancellation short a conductor to ground or cause damage to the other equipment connected to the equalizer For balanced connection wire the connectors as follows For unbalanced operation wire the connectors as follows JACH
6. FRONT PANEL CONTROLS AND CONNECTIONS REAR PANEL CONTROLS AND CONNECTIONS nennen nnne Ibid P MN Sound Reinforcement tear Stet Musical Instrument Studio Applications ieri eneee nnee SPECIFICATIONS Mp r 13113 TO REDUCE THE RISK OF FIRE RE un PLACE ONLY WITH SAME TYPE FUSE ATTENTION UTILISER UN FUSIBLE DE RECHANGE DE GEQ 215 215LF MEME TYPE 2 Channel 15 Band Graphic Equalizers WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE DO NOT REMOVE CHASSIS OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL GEQ 231 2 Channel 31 Band Graphic Equalizer RISK OF ELECTRIC SHOCK DO NOT OPEN Graphic Equalizer GEQ Series GEQ 131 1 Channel Single Rack Space 31 1 3rd Octave Bands GEQ 131LF 1 Channel Double Rack Space 31 1 3rd Octave Bands Long Throw Faders 60mm travel GEQ 215 2 Channel Single Rack Space 15 2 3rd Octave Bands Each Channel GEQ 215LF 2 Channel Double Rack Space 15 2 3rd
7. Hz E Also when you use the equalizer with other pieces of equipment such as the NADY AUDIO CL 5000 Compressor Limiter with Gate you can do real signal processing magic Emphasizing the HIGH frequencies of a signal and feeding the modified signal to the side chain of the compressor makes the compressor a DE ESSER or emphasizing the LOW frequencies and putting that through the side chain makes the compressor a DE THUMPER Also you can reduce unwanted frequency dependent noise in a signal by cutting the offending frequencies with an equalizer and letting the noise gate of the CL 5000 KEY on the modified signal while letting the original signal pass and gating the unwanted sounds See the instruction manual for the NADY AUDIO CL 5000 for more ideas and detail on methods to utilize your equalizer in the fullest SPECIFICATIONS Equalizer Equalizer Control Bands 1X31 1 3 Octave ISO Spacing From 20Hz to 20KHz 2X31 1 3 Octave ISO Spacing From 20Hz to 20KHz 2X15 2 3 Octave ISO Spacing From 25Hz to 16KHz Filter Type Constant Q Slider Travel 20mm Center Detent for GEQ 131 215 231 60mm Center Detent for GEQ 131LF 215LF Level Control Range 6 or 12dB Selectable Inputs Type Active Balanced Unbalanced Connectors 3 P XLR 1 4 TRS Balanced RCA Unbalanced Impedance 20K Ohms Balanced 15K Ohms Unbalanced Maximum Level 18dBV Outputs Type Active Balanced Unbalanced Connectors 3
8. OT ATTEMPT TO SERVICE THIS UNIT YOURSELF AS IT CAN BE DANGEROUS AND ALSO WILL VOID THE WARRANTY NADY AS UI CO NADY SYSTEMS INC 6701 SHELLMOUND STREET EMERYVILLE CA 94608 Tel 510 652 2411 Fax 510 652 5075 www nadywireless com
9. P XLR 1 4 TRS Balanced RCA Unbalanced Impedance Typically lt 600 Ohms Maximum Level 16dBV Clip LED Threshold Below Clipping Low Cut High Pass Filter GEQ 131 131LF 231 10Hz to 250Hz 12dB Octave variable GEQ 215LF 40Hz 12dB Octave switchable Low Pass High Cut Filter GEQ 131 131LF 231 3KHz to 50KHz 12dB Octave variable GEQ 215LF 16KHz 12dB Octave switchable Frequency Response 20Hz 20KHz 1dB THD Noise 0 0296 1KHz all faders at mid position Signal to Noise Ratio 93dB 1KHz Channel Separation 60dB 1KHz Line Voltage 100 130V AC 50 60Hz 200 240V AC 50Hz Power Consumption Maximum 15 watts Size 19 W X 3 5 H X 8 66 D 2U 48 2cm X 8 8cm X 22 0cm For GEQ 131LF 215LF 231 19 W X 1 75 H X 8 66 D 1U 48 2 X 4 4cm X 22 0cm For GEQ 131 215 Weight 6 1613 2 8Kg GEQ 215 6 3815 2 9Kg 131 7 0413 3 2Kg GEQ 131LF 7 710 3 5Kg GEQ 215 11 44 Ibs 5 2Kg GEQ 231 For improvement purposes all specifications and design are subject to change without notice NOTES SERVICE FOR YOUR NADY AUDIO PRODUCT U S Should your NADY AUDIO Product require service please contact the Nady Service Department via phone at 510 652 2411 or E mail at service nadywireless com INTERNATIONAL For service please contact the NADY AUDIO distributor in your country through the dealer from whom you purchased this product DO N
10. be that there is a ground incompatibility between your equalizer the other equipment in the same system There are several combinations that can be attempted Note ALWAYS TURN YOUR AMPLIFIERS DOWN BEFORE CHANGING YOUR GROUNDS AROUND Try different combinations of lifting grounds with the ground lift switches or make sure all chassis are connected to earth ground either through the A C power cord ground or by the front panel rack mount Screws Before starting to equalize your sound system there is some information you should know and procedures you should follow These NADY AUDIO equalizers are equipped with a BYPASS switch with an LED indicator If you disable the BYPASS switch the LED will turn off and all equalization settings will be restored In bypass mode the audio signal will flow through at unity gain Use the range selection switch to select between or 12 level adjust range The dual color range LED will indicate green for and red for 12dB The input level control allows adjustment between OFF center detent and 6dB Note The unit is equipped with a red overload LED which illuminates when the signal reaches 5 prior to clipping It is normal for the overload LED to flash occasionally but if the overload LED is on steady you must readjust the level control Below are some tips to follow while doing the initial set up 1 Set channel levels to the center detent OdB unity gain on the fr
11. e overall sound quality D In noisy environments the audio signal may be tailored for better intelligibility and penetration This is especially useful for public address systems E Creative use of the equalizer allows shaping of the signal for a more pleasing sound or for special effects The only limits are those of taste and imagiation Musical Instrument Applications A Putting an equalizer in line with a musical instrument allows you to modify the sound of the instrument You can brighten the sound or add body to a thin sounding instrument or even give the sound a totally different character B An equalizer will allow you to eliminate unwanted sounds like 60 cycle HUM from a badly grounded amplifier INSTALLATION TYPICAL SET UP Studio Applications A graphic equalizer is one of the most useful tools in the sound engineer s bag NADY AUDIO equalizers offer the features and flexibility to perform where it counts in the studio A Fix a track that doesn t sound quite right Put the equalizer in an effects send and return it to the MIX bus B Create an artificial stereo by splitting a monaural signal and equalizing the split signals differently then panning one equalized signal to the right and the other signal to the left C Shape the sound by changing the frequency response of the track D Special effects like a telephone sound can be created by cutting off the LOW end to 200Hz and the HIGH end to 6K
12. e plug with wet hands Always pull out by the plug and never the cord Only let a qualified professional repair the equipment An unauthorized person might touch the internal parts and receive a serious electric shock Never allow a child to put anything especially metal into the equipment Protecting your NADY AUDIO Graphic Equalizer Use only a household AC power source Never use a DC power source f water is spilled on or in the unit unplug it and call for service Make sure that the equipment is well ventilated and away from direct sunlight Avoid damage to the internal circuits and the external surface by keeping the unit away from sources of high heat Avoid using spray type insecticide or solvents near the equipment It can damage the finish an might ignite suddenly To avoid damaging the finish never use denatured alcohol paint thinner or other similar chemicals to clean 6 the equipment Place the unit on a flat and solid surface or in a rack To enjoy your NADY AUDIO graphic equalizer for a long time please read this owner s manual thoroughly Signal Levels Signal levels from 18dBu to 18dBu are considered normal Do not directly connect microphones into the equalizers Microphones require a pre amp Chassis Grounding NADY AUDIO equalizers are equipped with a rear panel ground lift switch If after setting up your system the system exhibits excessive hum or buzzing the problem may
13. equalizer automatically reverts to bypass 6 Peak Clip Indicator This red LED illuminates if any section of the equalizer is within 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 6 REAR PANEL CONTROLS AND CONNECTIONS 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 1 MuR GT ESILL RE 7 EE c 9o O sos o soe 2 OQ cx GES o
14. ers 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 can be efficiently used to attenuate the HUM noise from preced ing instruments or to prevent the low frequency resonance that can occur when speakers are installed in an enclosed acoustic environment 3A High pass Filter Switch and Indicator GEQ 215 215LF 40 Hz 12dB octave HPF LED lights when activated 4 Filter Range Switch amp Indicators The gain range of the filter sliders is switchable as a group from to 12dB for maximum boost cut capability At 6dB the green LED will illuminate and at 12 dB the red LED will illuminate Ce se S GEQ gt 9 l IHHHHHH 5 In Out Bypass Switch amp 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
15. h any output con nector only one of these connectors is to be used at a time TYPICAL SETUP NADY AUDIO graphic equalizers may be used wher ever 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 to the amps and or speakers By rolling off the extreme LOW frequencies with the LOW CUT filter a measure of protection is added to the system without severely affecting th
16. ont panel 2 Enable the BYPASS switch Note The red LED is ON 3 Set all slide controls to the center detent or OdB unity gain position 4 Select the 6dB range switch green LED ON 5 Apply signal to the system 6 Disable the BYPASS switch red LED OFF 7 If the CLIP overload LED is on you must turn down the level control 8 You may now start equalizing your system 9 Switch the range switch to 12dB red LED is lit if the 6dB range does not provide sufficient gain 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 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 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 3 Low Cut High Pass Filter GEQ 131 131LF 231 These equaliz
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