Nady Systems GEQ131 User's Manual
Contents
1. Owner s Manu 1 25K 1 6K 2K 8K 10K 12 5K 16K 20K 800 1K 2 5K 3 15K 4K POWER GEQ 131 31 BAND GRAPHIC EQUALIZER CEF POWER can CHQ GAN CHA A 020 A 00 Low mO 3 tow eo OS GEQ 215 O mal 3 6 12 CUT 0 s 00 ON mm 12 mm orr aL CUT 0 DUAL 15 BAND 5 o GRAPHIC EQUALIZER dB ON m 12 mm orr 12 12 1 25K_1 6K__2K__2 5K_3 15K__4K 5K_ 6 3K_ 8K_ 10K_12 5K_16K POWER 1K_1 25K_1 6K__2K__2 5K_3 15K__4K 5K __6 3K 8K 10K 12 5K 16K 20K GEQ 231 DUAL 31 BAND GRAPHIC EQUALIZER Contents Eo 2 en ee eee ene ne Ree ne eee 2 WV AU MND E sation E E E E E AET 3 ITS CAM AUI OW isgesccescicasacrinsasmiieneeannisa oeeneaassssdeseteadiecerssaioentenenianeeeineids 4 Front Panel Controls amp Connections ccccccseeeeeeeeeees 5 Rear Panel Controls amp Connections ccccccceeeeeeeeeees 6 Riel ets e 0 0 gt ai tent tea ce nent ees ena 7 Sound Reinforcement Applications ccccccseccseseeeseeeeeeeeeeees 7 Musical Instrument Applications ccccccccecesseeeseeeeeeeeeeeeesaeees 7 Studio Applications aces cibenccenede devise oetibecacseciecsecteevienloriesleasadcosndeeste nels 7 Specifications 2 0 cece eececeeeeceeeeaeeeeaeeetaeeeaneeneneeaneeeaaeenans 8 NOTOS atn te ee eR eee eee eRe 9 Congratulations on your choice of graphic equali2. 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 to avoid any turn on off transient noise 2 Gain Control The Gain control allows adjustment between OFF center detent and 12dB 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 Unity gain can be achieved by setting this control to its center detent position The unit is equipped with a red Peak LED which illuminates when the signal reaches 3dB prior to clipping It is acceptable for the Peak LED to flash occasionally however if the Peak LED is flashing steadily the Gain control should be reduced to avoid distortion 3 Low Cut Filter This switch enables a low cut filter at 40Hz 12dB octave to remove unwanted low frequencies from the signal to prevent DUAL 15 BAND GRAPHIC EQUALIZER stage rumble and low frequency resonance that can occur while using speakers in an enclosed acoustic environment The LED status indicator will light yellow when the Low Cut is enabled 4 EQ ON OFF This switch enables or bypasses the equalizer filters If you disable the EQ ON OFF switch the LED will turn off and the unit will be in bypass mode In bypass mode the audio signal will flow through without any equalization although the Gain control will still be active 5 Output
3. AUDIO Product U S Should your NADY AUDIO product require service please contact the NADY Service Department via telephone at 510 652 2411 or e mail at service nady com International For service please contact the NADY AUDIO distributor in your country through the dealer from whom you purchased this product Do not attempt to service this unit yourself as it can be dangerous and will also void the warranty AAN TUIS LOSIC gt NADY SYSTEMS INC 6701 Shellmound Street Emeryville CA 94608 Tel 510 652 2411 Fax 510 652 5075 www nady com
4. Level LED Bargraph This four stage LED bargraph illuminates according to the output signal level The red Peak LED lights at 3dB prior to clipping Occasional blinking of the Peak LED is acceptable but if it remains on more than intermittently you should turn down either the equalizer s level controls or reduce the input Gain level 6 Filter Level Slider Controls Each one of these linear potentiometers will boost or cut its noted frequency by 12dB When all of the sliders are in center detent position the output of the equalizer is flat Each slider is marked with the center frequency of its band pass filter Rear Panel Controls amp Connections CAUTION To REDUCE THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE AND RATING OF FUSE ATTENTION UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS QUVRIR AC INPUT WARNING To REDUCE THE RISK OF FIRE OR ELECTRIC 110 60Hz SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE FUSE Sisma asov sen OT UNBALANCED OUTPUT O CHANNEL 2 BALANCED INPUT AD NADY SYSTEMS Inc systeus Emeryville CA USA MADE IN CHINA seu a ce AC INPUT 110 60Hz EMA 250 CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION To REDUCE THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE AND RATING OF FUSE ATTENTION uTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE ATTENTION RISQUE DE CHOC ELECTRIQUE NE PA
5. and the HIGH end to 6KHz 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 Level Control Range 12dB INPUTS Type Active Balanced Unbalanced Connectors 3 Pin XLR 1 4 TS Balanced Impedance 40K Qs Balanced 20K Os Unbalanced Maximum Level 28dBV OUTPUTS Type Unbalanced Connectors 3 Pin XLR 1 4 TRS Impedance Typically lt 400 Qs Maximum Level 20dBV Clip LED Threshold 3dB Below Clipping Low Cut Filter 40Hz 12dB octave Frequency Response 20Hz 20KHz 1dB Specifications THD Noise lt 0 008 1KHz all faders at mid position Signal to Noise Ratio 95dB 1KHz Channel Separation 60dB 1KHz Line Voltage 100 130V AC 50 60Hz Power Consumption Maximum 15 watts SIZE 19 W X 3 5 H X 5 D 2U 48 2cm X 8 8cm X 12 7cm For 231 19 W X 1 75 H X 8 66 D 1U 48 2cm X 4 4cm X 12 7cm For GEQ 131 215 WEIGHT 4 15lbs 1 9Kg GEQ 215 Albs 1 81Kg GEQ 131 6 85 Ibs 3 1Kg GEQ 231 The specifications above are correct at the time of printing of this manual For improvement purposes all specifications for this unit including design and appearance are subject to change without prior notice Notes Service For Your NADY
6. or near a swimming pool etc This product should be used only with a cart or stand that will keep it level and stable and prevent wobbling This product in combination with headphones or speakers may be capable of producing sound levels that could cause permanent hearing loss Do not operate for a long period of time at a high volume level or at a level that is uncomfortable If you experience any hearing loss or ringing in the ears you should consult an audiologist the outlet s or extension cord s power rating is exceeded and 3 never be left plugged into the outlet when not being used for a long period of time 9 Care should be taken so that objects do not fall into and liquids are not spilled through the enclosure s openings 10 The product should be serviced by qualified service personnel if A The power supply cord or the plug has been damaged B Objects have fallen into or liquid has been spilled onto the product C The product has been exposed to rain D The product does not appear to operate normally or The product should be positioned so that proper ventilation is exhibits a marked change in performance maintained 6 The product should be located away from heat sources such as radiators heat vents or other devices including amplifiers that produce heat The product should be connected to a power supply only of the type described in the operating instructions or as E The product has been d
7. S QUVRIR WARNING To REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE 7 IEC Power Cord Receptacle This is used to connect the AC power source to your equalizer Power requirements 115VAC 60Hz 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 8 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 UNBALANCED BALANCED AD OUTPUT INPUT SYSTEMS NADY SYSTEMS Inc Emeryville CA USA MADE IN CHINA AC INPUT 110 60Hz O ADY nany systems Inc rise es Emeryville CA USA C 315mA 250V SERIAL DO NOT OPEN ATTENTION SHOCK HAZARD DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS QUVRIR CHANNEL 1 UNBALANCED O BALANCED OUTPUT INPUT O CHANNEL 1 UNBALANCED OUTPUT O CAUTION After checking the AC supply voltage be sure that the correct fuse is in the fuse holder A 20mm glass tube 500mA 250V fast blow fuse should be used 9 Input Output Connectors Balanced XLR and 1 4 TRS Inputs and unbalanced output jacks for line level operation Line level signals from 18dBu to 18dBu are considered normal Do not directl
8. ck or one of the many rack type por table cases available on the market The units are either 1u single rack 1 75 or 2u double rack 3 5 as noted All three models are 5 inches deep Install the equalizer in a rack with rack screws not included 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 is shielded against radio frequency RF and electromagnetic interference EMI extremely high fields of RF and EMI should be avoided Paralleling inputs and outputs may be accomplished by using any of the 2 connectors POWER CONNECTION Each of these three NADY AUDIO graphic equalizers is designed for operation with 105 130 volts AC at 60Hz power sources Power requirements for electrical equipment differ from area to area In new installations and portable sound systems or any situation in which the AC power is in question it is wise to confirm the voltage before connecting the instrument to power sources PRECAUTIONS Protecting yourself from electric shock e Never touch the plug wit
9. e of protection is added to the system without severely affecting the overall sound quality In noisy environments the audio signal may be tailored for better intelligibility and penetration This is especially useful for public address systems 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 imagination 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 An equalizer will allow you to eliminate unwanted sounds like a 60 cycle HUM from a badly grounded amplifier 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 B Fix a track that doesn t sound quite right Put the equalizer in an effects send and return it to the MIX bus 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 Shape the sound by changing the frequency response of the track Special effects like a telephone sound can be created by cutting off the LOW end to 200Hz
10. h wet hands e Always pull out by the plug and never the cord e Only let a qualified professional repair the equipment An unauthorized person might touch the internal parts and receive a serious electric shock Note Removing the chassis screws and opening the unit will automatically void your warranty e Never allow a child to put anything into the equipment Protecting your NADY AUDIO Graphic Equalizer e Use only a household AC power source Never use a DC Installation power source If 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 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 Front Panel Controls amp Connections iets g GEQ 131 31 BAND GRAPHIC EQUALIZER Pd 1 Power Switch To turn the equalizer ON or OFF press the upper or lower portion of this button The internal LED indicator will light when the unit is on CAUTION
11. ropped or the enclosure damaged 11 Do not attempt to service the product beyond what is described in the user maintenance instructions All other servicing should be referred to qualified service personnel marked on the product Replace the fuse only with one of the specified type size and correct rating The power supply cord should 1 be undamaged 2 never share an outlet or extension cord with other devices so that CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL Date of Purchase Dealer s Name City An equilateral triangle enclosing a lightning flash arrowhead symbol is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure 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 instructions in the literature enclosed with this unit Serial INSTALLATION To ensure years of enjoyment from your NADY AUDIO graphic equalizer please read and understand this manual thoroughly before using the unit These three equalizer models are each designed for mounting in a standard 19 equipment ra
12. y connect microphones into the equalizers Microphones require a pre amp Note Only one input and one output connector should be used at a time Typical Set Up NADY AUDIO graphic equalizers may be used wherever modifi cation 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 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 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 measur
13. zer you have purchased one of the finest graphic equalizers on the market today This unit was developed using the expertise of professional sound engineers and working musicians You will find that your new NADY AUDIO Equalizer has superior performance and greater flexibility than any other equalizer in its price range Please read this manual carefully to get the most out of your new unit Thanks for selecting NADY AUDIO as your choice in graphic equalizers Features GEQ 131 1 Channel Single Rack Space 31 1 3rd Octave Bands GEQ 215 2 Channel Single Rack Space 15 2 3rd Octave Bands Each Channel GEQ 231 2 Channel Double Rack Space 31 1 3rd Octave Bands Each Channel Balanced unbalanced XLR and 1 4 TRS input output connectors Constant Q bandwidth from each filter with 3 center frequency accuracy Parallel filter design for minimal phase distortion Ultra low noise circuitry Low cut filter at 40Hz 12dB octave switchable with status LED Band range 12dB gain Center detents on faders Variable input level control 12dB Equalizer ON OFF bypass switch with status LED Gain status LED bargraph with peak LED Power switch with integral LED ON indicator Shielded internal power supply with AC Compact and durable all steel chassis design Warning Read all instructions before using the product Do not use this product near water e g near a bathtub washbowl kitchen sink in a wet basement
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