EQ300 Series Graphic Equalizers EQ341 DUAL CHANNEL 15-BAND 2/3 OCTAVE EQUALIZER EQ351 SINGLE CHANNEL 31-BAND 1/3 OCTAVE EQUALIZER EQ355 DUAL CHANNEL 31-BAND 1/3 OCTAVE EQUALIZER USER'S GUIDE
IMPORTANT SAFETY INSTRUCTIONS – READ FIRST This symbol, wherever it appears, alerts you to the presence of uninsulated dangerous voltages 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 instructions in the accompanying literature. Please read the manual. Read instructions Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the equipment.
IMPORTANT SAFETY INSTRUCTIONS – READ FIRST ................................................................. 2 OVERVIEW ..................................................................................................................................................................... 4 GENERAL INFORMATION .................................................................................................................................. 5 INSTALLATION...........................................................
OVERVIEW The ART EQ300 Series of graphic equalizers have been designed and engineered to extremely high standards for audio performance and functionality. These innovative, high-quality equalizers are perfect for virtually any audio application where precision frequency tailoring, reliable performance, rugged design and extremely silent processing is important. Active Filter Sections A passive bypass switch allows for direct comparison between the equalized and nonequalized signal for each channel.
GENERAL INFORMATION Your ART equalizer is a professional quality unit perfect for virtually any audio application where frequency tailoring is needed.
CHASSIS GROUNDING The equalizers are equipped with a rear panel grounding screw and Ground Lift switch. The Ground Lift switch should normally be set to the GND position. After set up, if your system exhibits excessive hum or buzzing, the problem may be a due to a ground differential between your equalizer and other equipment in the same system. The Ground Lift switch lets you try several combinations to minimize system hum. NOTE: ALWAYS TURN YOUR AMPLIFIERS DOWN BEFORE CHANGING GROUNDS.
OPERATION FRONT PANEL CONTROLS POWER SWITCH To turn the equalizer on or off, press the upper or lower portion of the POWER switch. 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. FILTER LEVEL CONTROLS Each of these sliders controls the signal level of each of the 31 (or 15) bandpass filters. A detent at the center position helps center the controls for a flat response.
HI PASS FILTER (LOW-CUT FREQUENCY CONTROL) (EQ351 and EQ355 only) To cut down on unwanted low frequency signals, this control determines the roll-off frequency of the Hi-Pass Filter (HPF). The roll-off frequency can be adjusted from 10Hz to 250Hz by turning this knob. Because of its high roll-off slope, the HPF can be efficiently used to cut down hum and low frequency noise from preceding instruments, or to reduce low frequency resonances, when speakers are installed in an enclosed acoustic environment.
REAR PANEL CONNECTORS & CONTROLS 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, LINE VOLTAGE SWITCH & GROUNDING SCREW This fuse holder contains the AC primary fuse. This fuse should be replaced with the same type fuse if it is blown. If they continuously blow, stop replacing fuses and refer servicing to qualified personnel.
INPUT/OUTPUT CONNECTORS EQ341 EQ351 EQ355 10
1/4" TRS Phone Jacks The TRS (Tip Ring Sleeve) connectors are balanced and wired as Tip = High (+), Ring = Low (-), and Sleeve = Ground.
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.
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, (ART) 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 three years from the date of purchase.
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 that the unit has power supplied, that all cables are connected correctly, and that the cables themselves are in working condition. You may want to consult with your dealer for assistance in troubleshooting or testing your particular configuration. 2. If you believe that the ART unit is at fault, go to www.artproaudio.com.
SPECIFICATIONS EQUALIZER Bands 2 x 15, 2/3 octave, ISO spacing (EQ341) 1 x 31, 1/3 octave, ISO spacing (EQ351) 2 x 31, 1/3 octave, ISO spacing (EQ355) Type / Accuracy Constant-Q / 3% center frequency Travel 20mm w/ positive center detent Range ±6dB or ±12dB, selectable Overall Gain Range Off to +6dB (unbalanced out) sliders centered Off to +12dB (balanced out) sliders centered INPUTS Type Active balanced/unbalanced Connectors 3-Pin XLR, 1/4” TRS (balanced), RCA (unbalanced) Impedance 20k Ohms
www.artproaudio.com E-mail: cserve@artproaudio.com © 2010 Applied Research & Technology EQ341, EQ351, EQ355 V1.
