Art 442 Manuale utente

442 EQ

DUAL CHANNEL 15 BAND 2/3 OCTAVE GRAPHIC EQUALIZER

452 EQ

SINGLE CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER

USER’S GUIDE

EQUALIZER OVERVIEW – FEATURES AND GENERAL INFORMATION:

MODEL 442 TWO CHANNEL 15 BAND 2/3 OCTAVE PRECISION GRAPHIC EQUALIZER

The Model 442 features constant Q circuitry with a 3% center frequency accuracy. Special features

include 60MM full range precision Sliders, LED metering, selectable range 6dB or 12dB, active

balanced and unbalanced input/output connectors, RFI filters, variable input level control, passive

bypass switch, clip level indicators, ground lift switch, and selectable line voltage switch.

MODEL 452 SINGLE CHANNEL 31 BAND 1/3 OCTAVE PRECISION GRAPHIC EQUALIZER

The Model 452 features constant Q circuitry with a 3% center frequency accuracy. Special features

include 60MM full range precision Sliders, LED metering, selectable range 6dB or 12dB, active

balanced and unbalanced input/output connectors, and RFI filters. The unit also has variable Hi Pass

(low cut) and Low Pass (high cut) filters, variable input level control, passive bypass switch, clip level

indicator, a ground lift switch, and selectable line voltage switch.

INSTALLATION

The Model 442 and 452 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 measurements are 3.2

inches. Both models are 8.5 inches in depth.

POWER CONNECTORS

The Model 442 and 452 Equalizers have internal power supplies and are designed for operation from

120-240 volt, 50-60Hz mains supply. Power consumption is 12 watts. In new installations and port-

able sound systems, or any situation in which the mains power is in question, it is wise to confirm the

voltage and select the appropriate line voltage switch BEFORE connecting the equalizer to power

sources.

INPUT/OUTPUT CONNECTIONS

The Model 442 and 452 Equalizers have three paralleled input and output connectors. XLR and 1/4”

TRS are actively balanced with pin 2 or the tip being Hi (Hot), Pin 3 or the ring being Lo, and Pin 1 or

sleeve being ground. Unbalanced operation requires using the RCA phono connector or use Pin 2 of

the XLR or tip 1/4” TRS as ground.

Balanced output requires using Pin 2 of the XLR or the tip of the 1/4” TRS as output Hi (+) and using

pin 3 of the XLR or the ring of the 1/4” TRS as Lo (-). It does not require pin 1 or signal ground. The

signal exists differentially between the two balanced leads. Ground is used only for shielding to

prevent potential hum. Paralleling inputs and outputs may be accomplished by using any of the three

connectors. Note: 1/4” TRS are normally used.

SIGNAL LEVELS

Signal levels from -10 dBu to +4 dBu are considered normal and 20dB of headroom exists above

these levels. Do not connect microphones directly to the equalizer. Microphones require a preamp.

CHASSIS GROUNDING

The Model 442 and 452 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 incom-

patibility between your equalizer and other equipment in the same system. There are several combi-

nations that can be attempted. NOTE: ALWAYS TURN YOUR AMPLIFIERS DOWN BEFORE

CHANGING GROUNDS. Try different combinations of lifting grounds on units that are supplied with

ground lift switches or make sure all chassis are connected to earth ground, either through the AC

Power cord ground or by the front panel rack mount screws.

OPERATING INSTRUCTIONS

Before starting to equalize your sound system there is some information you should know and proce-

dures you should follow. Your equalizer is equipped with a bypass switch. The bypass switch, when

activated, lights the LED and cancels all equalization settings while allowing signal to flow through the

unit at unity gain.

Also included is a range selection switch with LED indicators, 6dB =green, 12dB= yellow. In addition

to the range selection switch there is a level control potentiometer. The level control operates be-

tween off and +6dB. Note: If there is too much gain your equalizer has a red LED Clip indicator. The

Clip LED illuminates when signals reach 5dB prior to clipping. If this situation occurs and the overload

LED flashes occasionally, this is okay. However, if the overload LED is steadily on, you must readjust

the level control.

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. Bypass the equalizer (Note: Select the bypass switch and press - the red LED is on.)

3. Set the frequency slide controls to the center detent or 0dB.

4. Select the 6dB range switch (green LED on).

5. Apply signal to the system.

6. Release the bypass switch, red LED off.

7. If the Clip LED is on you must turn down the input level control.

8.You may now start equalizing your system.

9. If you do not have enough gain for your needs, switch the range switch to the 12dB setting.

10. If the Clip LED lights continuously, turn down the level control until the LED is off most of the time.

FRONT PANEL CONTROLS

1. POWER SWITCH

To turn the equalizer ON or OFF, press the upper or lower portion of this button. CAUTION: Always

turn on your equalizer BEFORE your power amplifiers are turned on, and always turn off your equal-

izer AFTER your power amplifiers have been turned off.

2. FILTER LEVEL CONTROLS

Each of these sliders controls the output level of each of the 31 (or 15) bandpass filters. The center

detent position is grounded to assure flat response.

3. FILTER RANGE SWITCH & INDICATORS

The gain range of the filter sliders is switchable (as a group) from +/- 6dB to + /-12dB for maximum

boost/cut capability. At 6dB the green LED will illuminate and at 12dB the yellow LED will illuminate.

4. BYPASS SWITCH & INDICATOR

When the red 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 circuit (often referred to as

”hard-wire bypass”). Use this switch to compare equalized and unequalized material, or to bypass the

EQ section in the event of power loss or unit failure.

5. OVERLOAD INDICATOR

This red LED illuminates if any section of the equalizer is within 5dB of clipping. Occasional flickering

of this LED is acceptable, but if it remains on more than intermittently you should turn down either the

equalizer’s level controls or reduce the output level of the preceding component to avoid audible

distortion.

6. HI PASS FILTER (LOW-CUT FREQUENCY CONTROL)

To cut down on unwanted low frequency signals, this control determines the roll-off frequency of the

High-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 the ”HUM” noise

from preceding instruments, or to reduce low frequency resonances, when speakers are installed in

an enclosed acoustic environment.

7. LOW PASS FILTER (HIGH-CUT FREQUENCY CONTROL)

To cut down on unwanted high frequency signals, this control determines the roll-off frequency of the

Low-Pass Filter (LPF). The roll-off frequency can be adjusted from 3kHz to 40kHz by turning the

knob. Because of its high roll-off slope, the LPF can be effectively used to cut down the high fre-

quency noise from preceding instruments, or roll-off excessive high frequency sounds to obtain a

more natural sound in acoustic situations.

8. LEVEL CONTROL

This controls the level of signal coming into the equalizer. Turn this control down if the Clip LED

illuminates steadily (meaning too strong an input signal). Unity gain can be set by turning this knob to

its center detent position.

9. LED Metering

Each channel of the equalizer has an LED array meter, showing its output level. Use the meter when

adjusting the output level Control to aid in sending the proper level to your next piece of equipment.

REAR PANEL CONNECTORS & CONTROLS

10. POWER CORD

This cord is used connect the AC power source to your equalizer. CAUTION: Equipment for USA

installation includes a captive power cord with a three-pin polarized plug. DO NOT REMOVE THE

CENTER GROUNDING PIN.

11. FUSE HOLDER

This fuse holder contains the AC primary fuse. This fuse should be replaced with the same type fuse

if it is blown out. If they continuously blow, stop replacing fuse and refer servicing to qualified person-

DUAL 15 BAND GRAPHIC EQUALIZER

31 BAND GRAPHIC EQUALIZER

nel. CAUTION: After checking the AC supply voltage, be sure that the correct fuse is in the fuse

holder; 0.6Amp for 100-103VAC, as well for 220-240VAC.

12. AC VOLTAGE SELECTOR

Set this slide switch to match your line voltage supply. CAUTION: For new installations and portable

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.

14. INPUT/OUTPUT CONNECTORS

1/4 TRS

The TRS (Tip Ring Sleeve) connector is balanced and wired as tip = Hi (+), Ring = Lo (-), and Sleeve

= Ground.

CAUTION: Only one of these sockets can be chosen for audio connection at the same time.

XLR

The XLR input connector is balanced and wired as Pin 2=Hi (+), Pin 3=Lo (-), and Pin 1=Ground.

CAUTION: Only one of these sockets can be chosen for audio connection at the same time.

RCA PHONO

The RCA Phono input is unbalanced at the tip = Hi (+) and the Sleeve = Ground.

CAUTION: Only one of these sockets can be chosen for audio connection at the same time.

FOR BALANCED CONNECTIONS

Wire the connectors as follows:

Phone Jack: Connection:

tip = high

ring = low

sleeve = ground

FOR UNBALANCED CONNECTIONS

Use 1/4 inch tip-ring-sleeve or mono phone plug connectors or RCA phone jack connectors wired as

follows:

Phone Jack: Connection:

tip = high

ring = no connection

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.

Typical reinforcement application of

a two channel equalizer

Equalization of a musical instrument Equalization of a guitar effects loop

Equalizaton of audio signals from a

mixer

Mixer

Instrument

Speaker

Speaker Mixer

Send

Return

Amp

PreAmp

Stereo

Effects

loop

Amp

P Amp

Guitar

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. Applied Research and Technology will, without

charge, repair or replace, at its option, defective product or component parts upon prepaid de-

livery to the factory service department or authorized service center, accompanied by proof of

purchase date in the form of a valid sales receipt.

Exclusions

This warranty does not apply in the event of misuse or abuse of the product or as a result of

unauthorized alterations or repairs. This warranty is void if the serial number is altered, de-

faced, or removed.

A R T reserves the right to make changes in design or make additions to or improvements

upon this product without any obligation to install the same on products previously manufac-

tured.

A R T shall not be liable for any consequential damages, including without limitation damages

resulting from loss of use. Some states do not allow limitations of incidental or consequential

damages, so the above limitation or exclusion may not apply to you. This warranty gives you

specific rights and you may have other rights, which vary from state to state.

For units purchased outside the United States, an authorized distributor of Applied Research

and Technology will provide service.

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.

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. Please write down a description of your complete setup be-

fore calling Customer Service.

3) Call the factory for a Return Authorization (RA) number.

4) Pack the unit in its original carton or a reasonable substitute. The packing box is not rec-

ommended as a shipping carton. Put the packaged unit in another box for shipping. Print the

RA number clearly on the outside of the shipping box. Print your return shipping address on

the outside of the box.

5) Include with your unit: a return shipping address (we cannot ship to a P.O. Box), a copy of

your purchase receipt, a daytime phone number, and a description of the problem.

6) Ship only your unit and its power supply (keep your manual!) to:

APPLIED RESEARCH AND TECHNOLOGY

215 TREMONT STREET

ROCHESTER, NEW YORK 14608

ATTN: REPAIR DEPARTMENT

RA# ____________________

7) Contact our Customer Service department at (585) 436-2720 for your Return Authorization

number or questions regarding technical assistance or repairs. Customer Service hours are

9:00 AM to 5:30 PM Eastern Time, Monday through Friday.

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