Art XL 231 Operation Manual
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Art XL 231 Operation Manual

Dual 31-band, 1/3 octave extended, long throw, professional equalizer
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OPERATION MANUAL

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Summary of Contents for Art XL 231

  • Page 1 OPERATION MANUAL...
  • Page 2 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.
  • Page 3 2% film capacitors. Enhanced Cut Mode The XL 231 offers an enhanced cut mode which allows more narrow filters and deeper cut of -18dB. This helps when trying to tame resonance and minimizing overall spectral changes. Only each filter’s cut mode is enhanced while their boost characteristic remains unchanged.
  • Page 4 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.

  • Page 5: General Information

    BEFORE connecting the equalizer to power sources. INPUT/OUTPUT CONNECTIONS The XL 231 has three sets of input and output connectors. These connections include XLR, ¼” balanced or unbalanced phone, and detachable Euroblock barrier strip connectors. The inputs are wired in parallel. The XLR and Euroblock output connections are also wired in parallel.

  • Page 6: Operating Instructions

    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.

  • Page 7: Front Panel Controls

    ±6dB (+6/-9 when Enhanced Cut Mode is active). ENHANCED CUT MODE The XL 231 offers an Enhanced Cut mode which has a more narrow filter bandwidth and additional cut range of -18dB. This helps when trying to tame resonance and minimizing overall spectral changes.

  • Page 8: Bypass Switch

    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”).

  • Page 9: Level Control

    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.

  • Page 10: Rear Panel Connectors

    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.

  • Page 11: Input/Output Connectors

    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.

  • Page 12: Application Notes

    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.
  • Page 13 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.
  • Page 14 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.
  • Page 15 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.

  • Page 16: Warranty Information

    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.
  • Page 17 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.
  • Page 18 XL231 SPECIFICATIONS EQUALIZER Bands Type/Accuracy Slide Potentiometers Range w/Enhanced Cut Overall Gain Range INPUTS Type Connectors Impedance Maximum Input Level OUTPUTS Type Connectors Impedance Maximum Level RFI Input Filters Bypass Switching Clip LED Threshold High Pass Filter High Trim Low Trim Frequency Response THD+Noise (typically 0.003% @ 1 KHz)
  • Page 19 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.
  • Page 20 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.com Model XL231 - Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer XL-5004-100...

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