OPERATION MANUAL
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer IMPORTANT SAFETY INSTRUCTION – READ FIRST This symbol, whenever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure that may be sufficient to constitute a risk of shock. This symbol, wherever it appears alerts you to important operating and maintenance voltage instructions in the accompanying literature. Please Read manual.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer INTRODUCTION The new ART XL 231 Dual 31 Band, 1/3 Octave Extended Long Throw Professional Equalizer has been designed and engineered to exceed extremely high standards for audio performance and functionality. This innovative, high-quality equalizer is perfect for virtually any audio application where precision frequency tailoring, reliable performance, rugged design and extremely silent processing are of the utmost priority.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer Variable Low Cut Filtering To help keep bass under control, the XL 231 Graphic Equalizer incorporates a variable swept Low Cut filter. Automatic Relay Bypass The XL 231 Graphic Equalizer also features automatic relay bypass of audio, an essential function if power to the unit is lost.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer GENERAL INFORMATION Congratulations on the purchase of your new ART equalizer. This professional equalizer is perfect for virtually any audio application where frequency tailoring is needed. INSTALLATION This equalizer is designed for mounting in a standard 19” equipment rack or rack type portable case. It is 3 standard rack units in height or 5.25 inches. The depth is 7 inches behind the front panel.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer OPERATING INSTRUCTIONS Before starting to equalize your sound system there is some information you should know and procedures you should follow. Your equalizer is equipped with a bypass switch. The bypass switch, when activated, lights the bypass red LED and cancels all equalization settings while allowing signal to flow directly through the unit at unity gain. When in the active state, the green LED is on.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer FRONT PANEL CONTROLS POWER SWITCH To turn the equalizer ON or OFF, press (and release) the POWER ON/OFF button. CAUTION: Always turn on your mixer and equalizer BEFORE your power amplifiers are turned on, and always turn off your equalizer AFTER your power amplifiers have been turned off. FILTER LEVEL CONTROLS Each of these sliders controls the signal level of each of the 31 bandpass filters.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer BYPASS SWITCH When the red Bypass LED is illuminated, this indicates that the unit or channel is in the bypass mode. Signal is routed directly from the input to the output without passing through any circuitry (often referred to as ”hard-wire bypass”). Use this switch to compare equalized and unequalized material, or to bypass the EQ section in the unlikely event of total unit failure.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer curves, and, have less selectivity so the Trim controls don’t have a “sound” as a typical tone control will. The Trim controls are typically used after the overall equalization has been set, yet the balance between highs, mids, and lows needs to be adjusted. For example, when providing sound at a venue, the equalizer may be set during a sound check.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer REAR PANEL CONNECTORS POWER CORD This cord is used to connect the AC power source to your equalizer. CAUTION: Equipment for USA installation includes a power cord with a three pin polarized plug. DO NOT REMOVE THE CENTER GROUNDING PIN. FUSE HOLDER This fuse holder contains the AC primary fuse. This fuse should be replaced with the same type fuse if it is blown.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer INPUT/OUTPUT CONNECTORS Although the XL 231 may be used with unbalanced connections, for optimum performance use balanced connections. Balanced connections help eliminate external sources of electrical noise. Only one of the 3 inputs should be used per channel. Any combination of output connectors may be used. ¼” TRS Phone The TRS (Tip Ring Sleeve) ¼” phone connections may be used balanced or unbalanced.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer APPLICATION NOTES 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. The Audio Spectrum, a Reference In general, what we hear extends over a range of frequencies from 20 Hertz (Hz) to 20 Kilohertz (KHz). This equates to roughly ten and one third octaves, an octave being a factor of two.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer overtones of guitar are intensified in this octave. Upper Highs: 10KHz to 20KHz The upper limits of hearing fall within this octave. Since only the upper harmonics of some instruments are in this range, you may often cut these bands to reduce hiss without affecting the overall sound quality. Brightness of cymbals and synthesizer harmonics may also be controlled.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer Tuning a sound system by ear. To tune a room by ear also makes sense. Test equipment won’t always indicate what sounds best. Acoustic environments are very complex and many tradeoffs are made. System performance can vary quite a bit from one listening position to another. Not only does frequency response vary, reverb decay times verses frequency can vary also.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer Set the equalizer for the monitor channel being set to flat with all of the sliders at their center detents. Slowly bring up the microphone gain until feedback occurs. Cut the level of the frequency band that the feedback occurs in. It takes practice to know which frequencies are in each band. As soon as the first tone disappears, increase gain more and a new tone will begin to build.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer WARRANTY INFORMATION Limited Warranty Applied Research and Technology will provide warranty and service for this unit in accordance with the following warrants: Applied Research and Technology, (A R T) warrants to the original purchaser that this product and the components thereof will be free from defects in workmanship and materials for a period of five years from the date of purchase.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer SERVICE The following information is provided in the unlikely event that your unit requires service. 1) Be sure that the unit is the cause of the problem. Check to make sure the unit has power supplied, all cables are connected correctly, and the cables themselves are in working condition. 2) If you find the unit to be at fault, write down a complete description of the problem, including how and when the problem occurs.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer XL231 SPECIFICATIONS EQUALIZER Bands Type/Accuracy Slide Potentiometers Range w/Enhanced Cut Overall Gain Range 2 x 31, 1/3 Octave, ISO Spacing Constant Q, 3% Center Frequency 45 mm, Positive Center Detent, Metal Shaft, Grounded Center Tap.
ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer XL231 Architect's & Engineer's Specification The graphic equalizer shall be stereo (2 channels). Each channel shall consist of 31 bands centered on standard ISO frequencies at intervals of 1/3 octave and covering a frequency range of 20Hz to 20KHz. Individual frequency bands shall be adjusted by linear slide faders with 45mm travel, tactile center detent, and metal actuator shafts with dust dams.
APPLIED RESEARCH & TECHNOLOGY 215 TREMONT STREET ROCHESTER, NEW YORK 14608 USA (585) 436-2720 – Voice (585) 436-3942 – Fax www.artproaudio.com E-mail: support@artproaudio.
