Applied Research and Technology (ART) 311 Owner's Manual

The ART Model 311

Precision Stereo 2-Way Active Crossover with Subwoofer Output

USER’S GUIDE

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TABLE OF CONTENTS

Introduction ........................................................................................... 3

Installation ............................................................................................. 4

AC Power Hookup ............................................................................... 4

Analog Audio Connections .................................................................. 4

Safety Precautions .............................................................................. 4

Controls ................................................................................................... 5

Power Switch ....................................................................................... 5

Low Output Level Control .................................................................... 5

Low Cut Filter Switch .......................................................................... 5

Crossover Frequency Control ............................................................. 5

High Output Level Control.................................................................... 6

Phase Switch ....................................................................................... 6

Sub Output Level Control .................................................................... 6

Subwoofer Frequency Control ............................................................. 6

Connections ........................................................................................... 7

XLR Input Jacks (Rear)........................................................................ 7

¼” Input Jacks (Rear) .......................................................................... 7

¼” Output Jacks (Rear)........................................................................ 7

Operation ............................................................................................... 8

Warranty Information .......................................................................... 10

Service .................................................................................................. 11

311 Specifications ............................................................................ 12

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INTRODUCTION

Thank you for purchasing an ART 311 - and congratulations: You now
own one of the most versatile crossovers available. Offering a superb level
of sound quality, the 311 circuit design, combined with a straightforward
user interface, quickly and easily gives you access to all of its features.

The Model 311 has been carefully designed, engineered and
manufactured to provide you with years of great sound and reliable service.
You’ll find it useful for pa systems for live sound reinforcement, public
address, karaoke and other various signal processing applications.

General Overview

The Model 311 is a fourth order Linkwitz-Riley Stereo 2-Way electronic
crossover with additional subwoofer output. Each channel of the 311

crossover splits the frequency of an input signal into two separate signals,
which may then be sent to amplifiers, or other signal processing equipment
in a sound system.

FEATURES:

• Balanced XLR and ¼” inputs

• ¼” Outputs

• 4-pole Linkwitz-Riley filter design (24dB/octave)

• Phase Reverse Switch on each channels High Output

• Switchable Low Cut (30Hz) filters on each channel and subwoofer

• Wide crossover frequency range (250Hz to 6kHz)

• Independent output level controls for each output

• Low noise circuitry

• Fully shielded all-steel chassis

• Internal AC power supply with standard IEC connector

• Designed and developed in the USA

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INSTALLATION

The 311 may be used in a wide variety of applications and
environments. Enclosed in a rack-mountable, all-steel enclosure, the
unit is designed for continuous professional use. Mounting location is
not critical. However, for greater reliability we recommend that you not
place the unit on top of power amps or other sources of heat.

AC POWER HOOKUP

The 311 has an internal power supply designed to operate at 115
VAC @ 50 to 60 Hz. Units manufactured for use outside the United
States of America have been modified to comply with the required
electrical specifications.

Before plugging the 311 into the main AC line, make sure that all of
the equipment following the crossover outputs, are turned off or all of
the outputs are turned down.

ANALOG AUDIO CONNECTIONS

Audio input connections to the 311 are balanced XLR (Pin 2 = Hot
(+), Pin 3 = Cold (-), Pin 1 = Ground) and ¼” phone plug (Tip = Hot (+),
Ring = Cold (-), Sleeve = Ground). All output connections are
unbalanced ¼” (Tip = Hot (+), Sleeve = Ground).

SAFETY PRECAUTIONS

Warning: To avoid the risk of shock or fire, do not expose this unit to

moisture. Refer all servicing to qualified personnel. Do not remove the
metal cover; there are no user-serviceable parts inside. When
applicable, only use the power adapter that came with this unit or one
obtained from ART’s Customer Service Department.

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