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Summary of Contents for Art HQ 231
- Page 1 HQ-231 DUAL CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER with FDC™ - Feedback Detection Circuit USER’S GUIDE...
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Page 2: General Information
HQ-231 DUAL CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER WITH FDC™ Congratulations on the purchase of your new ART equalizer. This professional equalizer is perfect for all applications and is also well suited for signal processing in situations where feedback is possible. -
Page 3: Installation
This precision is, of course, critical for professional applications. INSTALLATION These equalizers are designed for mounting in a standard 19” equipment rack or one of the many rack type portable cases available on the market. The vertical height is 3.5 inches and depth is 7.5 inches. -
Page 4: Signal Levels
Do not connect microphones directly to the equalizer. Microphones require a preamp. CHASSIS GROUNDING The equalizers are equipped with a rear panel Ground lift switch. After setting up your system, if the system exhibits excessive hum or buzzing, the problem may be a ground incompatibility between your equalizer and other equipment in the same system. - Page 5 readjust the level control. INITIAL SET UP Here are some tips to help you with the initial set up: 1. Set channel levels to the center detent 0dB on the front panel. 2. Select the Bypass switch to bypass the equalizer (Note: The red LED is on). 3.
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Page 6: Level Control
boost/cut capability. At 6dB the green LED will illuminate, and at 12dB the yellow LED will illuminate. 4. BYPASS SWITCH & CLIP INDICATOR LED Bypass Switch: When the red LED is illuminated, this indicates that the unit or channel is in the bypass mode. - Page 7 loses power (which causes the unit to go into bypass), the signal will be equal or lower than the active eq gain. This will ensure that a signal with undesirably higher levels will not be passed inadvertently. 8. FDC LED INDICATORS Each frequency band of the equalizer has a Feedback Detection Circuit LED, showing its relative feedback level.
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Page 8: Ground Lift Switch
sound systems, or any situation in which the mains power is suspect, it is wise to confirm appropriate voltage and line polarity BEFORE connecting the instrument to power source. 13. GROUND LIFT SWITCH This switch is used to disconnect the signal ground from the mains and chassis earth ground. You may set the switch to the LIFT position if ”Hum”, caused by a ground loop, can be heard at the speakers. - Page 9 APPLICATIONS 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. Typical reinforcement application of a two channel equalizer...
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Page 10: 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 pe- riod of three years from the date of purchase. - Page 11 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 condi- tion.
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Page 12: Specifications
SPECIFICATIONS EQUALIZER Bands Type Accuracy Travel Range INPUTS Type Connectors Impedance Maximum Level OUTPUTS Type Connectors Impedance Maximum Level OVERALL GAIN RANGE RFI filters Passive Bypass Switches Overload LED Threshold High Pass Filter Low Pass Filter Frequency Response THD + Noise IM Distortion (SMPTE) Signal to Noise Ratio Channel Separation... - Page 13 APPLIED RESEARCH & TECHNOLOGY 215 TREMONT STREET ROCHESTER, NEW YORK 14608 USA (585) 436-2720 – Voice (585) 436-3942 – Fax www.artproaudio.com E-mail: cserve@artproaudio.com HQ-231 DUAL CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER with FDC™ HQ231-5004-100...
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