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User's Manual
15/31 Band Graphic Equalizer
EQU Series
+18 +18
0dB 0dB
- -
R
LTO
www.altoproaudio.com
Version 1.0 April 2002
English
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SAFETY RELATED SYMBOLS wire or disconnect the wiring of protective grounding terminal. CAUTION RISK OF ELECTRIC SHOCK Operating Conditions DO NOT OPEN This apparatus shall not be exposed to dripping or splashing and that no objects filled with liquids, This symbol, wherever it appears, alerts you such as vases, shall be placed on this apparatus. to the presence of uninsulated dangerous voltage To reduce the risk of fire or electric shock, do not inside the enclosure-voltage that may be su- expos
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Preface Dear Customer: Thanks for choosing LTO Graphic Equalizer and thanks for choosing one of the results of LTO AUDIO TEAM job and researches. For our LTO AUDIO TEAM, music and sound are more than a job...are first of all passion and let us say...our obsession! We have been designing professional audio products for a long time in cooperation with some of the major brands in the world in the audio field. The LTO line presents unparalleled analogue and digital products made by Musicians for Mus
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TABLE OF CONTENT 1. INTRODUCTION ..........................................................................................................................4 2. FEATURE LIST ............................................................................................................................4 3. CONTROL ELEMENTS.................................................................................................................4 3.1 The Front Panel 3.2 The Rear Panel 4. INSTALLATION & CONNECTION
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1. INTRODUCTION Thank you very much for expressing your confidence in LTO products by purchasing our EQU Series Graphic Equalizers. With the EQU Series you have acquired an extremely musical and flexible Graphic Equalizer. The high-end EQU Series are based on many years of experience and are designed to provide a permanent precise equalization to the musician, performer, studio engineer and sound contractor. The EQU Series can be used wherever is requested to modify the frequency " contour " of
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EQU131VU Front Panel 11 31 Band Graphic Equalizer +12 +6 +17 +13 R LTO +9 POWER OUTPUT R LTO LTO 0 0dB EQU131VU -9 HI-PASS LOW-PASS BY-PASS RANGE -13 ON -12 -6 - OFF 40Hz 16 KHz CLIP 6 12 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 LEVEL POWER 1 2 312413 57 9 8 10 EQU231VU Front Panel 3 4 1213 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 LEV
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o o f f N N d d o o n n r r t t a a l h l h n n A A i i e e 2. Level control This control sets the input signal level to the equalizer. Its "0dB" position is unity gain (no boost or attenuation). If the clip LED(5) is light continuously, turndown this control until it only flickers occasionally. 3. High pass filter This button electronically inserts a filter into the signal path, which cuts the low frequencies at 40Hz (12dB per octave). The LED (12) indicator lights when the button is pressed an
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o o o f f f N N N d d d o o o n n n r r r t t t a a a l h l h l h n n n A A A i i i e e e EQU2215 Rear Panel 19 RISK OF FIRE-REPLACE FUSE AS MARKED Rheinland Production inspected C US PUSH PUSH MODEL NEW TIDE NEW TIDE SERIAL 3 3 21 21 20 18 17 16 15 17 16 15 EQU131VU Rear Panel 19 RISK OF FIRE-REPLACE FUSE AS MARKED PUSH Rheinland MODEL Production inspected NEW TIDE 3 21 SERIAL C US LIFT GND 20 18 17 16 15 EQU231VU/EQU231LED Rear Panel 19 PUSH NEW TIDE 3 21 RISK OF FIRE-REPLACE FUSE AS MARKED PU
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NOTE : While you can use any input connector with any output connector, only one set of these con- nectors is to be used at one time, detail wiring and connection, please refer to 4.2 audio connection. 18. Ground lift switch This switch is used to disconnect the signal ground from the mains and chassis earth. If it is determined that the equalizer is the cause of hum or buzz in your system due to a ground loop, move this switch to the "lift" position. 19. Fuse holder / Voltage selector This is a
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- In Line Connection For these applications the EQU Series Graphic Equalizer provides 1/4" TRS connectors, XLR connectors and RCA connectors to easily interface with most any professional audio device. Follow the configuration examples below for your particular connection. Balanced Tip Tip Ring Ring Sleeve Sleeve TIP RING SLEEVE SLEEVE RING TIP 1 1 2 2 3 3 Tip 1 Ring 2 Sleeve 3 TIP RING SLEEVE Unbalanced Tip 1 Ring 2 Sleeve 3 TIP RING SLEEVE Tip 1 2 Sleeve 3 TIP SLEEVE 1 Centre 2 3 Screen Tip Ti
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5. APPLICATION 5.1 The Sound Frequency In recording studios as well as stage or radio plays, the EQU Series Graphic Equalizer will be your valuable sound tool to modify the frequency "contour " of a sound .but first of all , you should clearify the typical frequency of each instrument and voice, so that can you obtain nice results in terms of sound characterization. The tables on the following pages give you an idea of specific frequencies and their acoustic significance. Typical Frequency of Ea
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5.2 Equalizer In Sound Reinforcement Systems The EQU Series Graphic Equalizers can be used in the sound reinforcement systems to : Eliminate unwanted sounds, such as the 60Hz Hum noise. Shape the sound by changing the frequency response of the track. Special effects like telephone sounds are done by cutting off the low end to 200Hz and the high end to 6KHz. Allow you to modify the sound of the instrument if put EQU Series Equalizer in line with a musical instrument. you can brighten the sound, a
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6. TECHNICAL SPECIFICATIONS Type EQU131 1 31 Band: 1/3 octave , ISO spacing (1H series) 2 15 Band: 2/3 octave , ISO spacing (1H series) EQU215 2 15 Band: 2/3 octave , ISO spacing (2H series) EQU2215 1 31 Band: 1/3 octave , ISO spacing (2H series) EQU131VU 2 31 Band: 1/3 octave , ISO spacing (2H series) EQU231VU / 231LED EQU231TWIN 2 31 Band: 1/3 octave , ISO spacing (4H series) Slider travel 20mm with positive centre detente (EQU131/EQU215/EQU231VU/EQU231LED) 60mm with positive centre detente (E
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7. WARRANTY 1. WARRANTY REGISTRATION CARD To obtain Warranty Service, the buyer should first fill out and return the enclosed Warranty Registration Card within 10 days of the Purchase Date. All the information presented in this Warranty Registration Card gives the manufacturer a better under- standing of the sales status, so as to purport a more effective and efficient after-sales warranty service. Please fill out all the information carefully and genuinely, miswriting or absence of this card wi
