Instruction/ maintenance manual of the product GEQ 131LF Nady Systems
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OWNER’S MANUAL OWNER’S MANUAL GEQ 131/ 131LF Single Channel 31 Band Graphic Equalizer GEQ 215/ 215LF 2 Channel 15 Band Graphic Equalizer GEQ 231 2 Channel 31 Band Graphic Equalizer POWER 10 +12 +6 -6 +3 -3 0 -12 0 LEVEL 5 31 BAND GRAPHIC EQUALIZER GEQ 131LF GEQ 131LF OFF ON BYPASS CLIP –6 –12 RANGE 40 60 15 250 10 HI PASS 15K 22K 7K 3K 50K LOW PASS 20 31.
Contents G G E E Q Q - - S S e e r r i i e e s s GRAPHIC EQUALIZER SERIES Congratulations! Y ou have just purchased one of the finest graphic equalizers on the market today . This EQ was devel- oped using the expertise of professional sound engi- neers and working musicians.
• 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 Octave Bands Each Channel, Long Throw Faders (60mm travel) • 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 3% center frequency accuracy • Parallel filter design for minimal phase distortion • Ultra low-noise circuitry • V ariable low-cut and low pass filters, 12dB/octave (GEQ 131/ 131LF/GEQ 231), switchable filters (GEQ 215LF) • Selectable range 6dB or 12dB • V ariable input level control • Equalizer ON/OFF bypass switch • Peak (overload threshold) LED • Internal power supply with AC input and selectable line voltage (1 10-240V AC, 50/60Hz) • Ground lift switch • Power off automatic bypass function FEA TURES W ARNING 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- sure, which may be of sufficient magnitude to constitute a risk of electric shock.
T o 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 mounting in a standard 19" equipment rack or one of the many rack type portable cases available on the market.
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 BYP ASS switch with an LED indicator . If you disable the BYP ASS switch, the LED will turn off and all equalization settings will be restored.
1. Power Switch T o 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.
9. IEC Power Cord Receptacle This is used to connect the AC power source to your equalizer . Power requirements: 1 15/230V AC, 50/60Hz 10. AC V oltage 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.
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.
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 T ype Constant Q Slider T ravel 20mm (Center Detent) for GEQ 131/215/231 60mm (Center Detent) for GEQ 131LF/215LF Level Control Range +/-6dB or +/-12dB (Selectable) Inputs: T ype Active Balanced/Unbalanced Connectors 3-P XLR, 1/4" TRS (Balanced), RCA (Unbalanced) Impedance 20K Ohms Balanced; 15K Ohms Unbalanced Maximum Level +/-18dBV Outputs: T ype Active Balanced/Unbalanced Connectors 3-P XLR, 1/4" TRS (Balanced).
SERVICE FOR YOUR NADY AUDIO PRODUCT (U.S.) Should your NADY AUDIO Product r equire service, please contact the Nady Service Department via phone at (510) 652-2411 or E-mail at email@example.com. (INTERNA TIONAL) For service, please contact the NADY AUDIO distributor in your country through the dealer fr om whom you purchased this pr oduct.
An important point after buying a device Nady Systems GEQ 131LF (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Nady Systems GEQ 131LF yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Nady Systems GEQ 131LF - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Nady Systems GEQ 131LF you will learn all the available features of the product, as well as information on its operation. The information that you get Nady Systems GEQ 131LF will certainly help you make a decision on the purchase.
If you already are a holder of Nady Systems GEQ 131LF, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Nady Systems GEQ 131LF.
However, one of the most important roles played by the user manual is to help in solving problems with Nady Systems GEQ 131LF. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Nady Systems GEQ 131LF along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center