ARX DI-4 User Manual

INTERNA TIONAL LIMITED WARRANTY

ARX Systems (ARX) warrants to the first purchaser of any ARX equipment that it is free
from defects in materials and workmanship under normal use and service. ARX’s sole
obligation under this warranty shall be to provide, without charge, parts and labour
necessary to remedy defects, if any, which appear within twelve (12) months from date of
purchase, and for a further twelve (12) months supply parts only.

This is our only warranty. It does not cover finish or appearance items, or if the
equipment has been, in ARX’s sole judgement:

•Subjected to misuse, abuse, negligence or accident;

•Repaired, worked on, or altered by persons not authorized by ARX;

•Connected, installed, adjusted or used for a purpose other than that for which it was
designed.

This warranty gives you and us specific legal rights and you may also have other rights
which may apply.

Warranty Service Procedure

Should it become necessary to have your equipment serviced under the
terms of the warranty, please follow these steps:

1. Call your ARX distributor for a Return Authorization (RA) number;

2. Carefully repack the unit, in its original packaging where possible,
including a note with a description of the problem, and a copy of
the receipt showing date of purchase. Attach these to the actual
unit itself. Don’t forget to write your name and address clearly, and
include a phone number where you can be contacted during
normal business hours. Make it easy for our service technicians to
contact you if they have a question. Also, use plenty of packing
material - better to be safe than sorry.

3. Send the unit freight prepaid to ARX Systems, at the address given
you with your RA number. We will pay the return freight when the
serviced unit is returned to you.

4. We strongly recommend you insure the package. We can’t fix it if it
gets lost! Send it by UPS, Fedex, or any similar service that can track
the package. Parcel Post is not recommended

If Warranty Registration Card is missing, please write to ARX in the country of
purchase, stating model and where purchased, or to ARX, PO Box 15, Cheltenham,
Victoria 3192, Australia.

Or you can Email us at: [e-mail]

DI-4

OWNER’S

MANUAL

ARX Systems Pty Ltd, PO Box 15,

Cheltenham, Victoria 3192, Australia

Phone: 03 - 9555 7859 Fax: 03 - 9555 6747

International Fax: [phone]

On the Web: http://www.arx.com.au

Email: [e-mail]

DI-4 Owner's Manual v 2.2 CE ©2000 ARX® DI-4 Owner's Manual v 2.2 CE ©2000 ARX®8

IMPORTANT

This is a dual voltage unit. It is essential that you check that the voltage on
the fuseholder cover below the AC connector on the rear of the chassis is
set correctly before connecting it to AC power.

THIS IS SET FOR

100 V AC TO 120 V

AC OPERATION

To change, pull fuseholder out and rotate 180o, then push in again. Do not
insert power cable into unit until voltage has been correctly set. Do not plug
power cable into AC power until voltage has been correctly set

- PLEASE READ THIS FIRST

THIS IS SET FOR

220 V AC TO 240 V

AC OPERATION

WARNING SYMBOLS USED ON THIS EQUIPMENT

This symbol is intended to alert you to the presence of important
operating instructions contained in this owner's manual

This symbol is intended to alert you to the presence of uninsulated
dangerous voltage within the product's enclosure that may be of
sufficient magnitude to constitute a risk of electric shock.

This symbol indicates that a Slow Blow fuse is used in this equip­ment. Replace with same type and value only

Complies with 89/336/EEC EMC Directive,
amended by 92/31/EEC and 93/68/EEC and
meets the following standards:EN 55013 :
1990, Sections 3.2 and 3.5 EN 55020 : 1988,
Sections 4.3, 5.4, 6.2, 7.0, 8.0.
Complies with Australian Standard AS/N25
1053

DI-4

Spe

DI-4 Specifications

Channels 1 - 4

High Z Input Impedance 2.2 Meg Ohm
Max Channel Gain 15dB
Clip LED Illuminates 1dB prior to clip
Direct Output Impedance 300 ohms Balanced
Max Input Level +20dB
Max Output Level +21dB
Signal to Noise -96dB(unity gain)
Frequency Response 20Hz to 20KHz, ±0.5dB
Distortion < 0.004%, 1KHz, +4dB
Output Connector 3 pin XLR

Left/Right Master

Output Impedance 300 Ohms Balanced
Max Output Level +21dB
Signal to Noise -90dB (unity gain)
Frequency Response 10Hz to 20KHz, ±0.5dB
Distortion < 0.004%, 1KHz, +4dB
Output Connector Balanced 3 pin XLR, Unbalanced jack

Auxiliary

Aux Send configuration Pre fade, post input gain
Max Output Gain +6dB
Output Impedance 150 Ohms unbalanced
Max Output Level +21dB
Aux In/ Out Connector Jack. Tip +, Sleeve Ground
Aux Return Type Constant amplitude into L/R busses,

Left jack for mono return

Max Input Gain +6dB
Input Impedance 40 K Ohms
AC Power 100-120, 220-240 V AC, 8 VA
Size 19”W x 6”D x 1¾”H, 482 x 155 x 44mm
Weight 2.2 Kg (5 lbs)

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DI-4 Owner's Manual v 2.2 CE ©2000 ARX® DI-4 Owner's Manual v 2.2 CE ©2000 ARX®

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Front Panel Controls

• Unbalanced Hi Z insulated phone jack Input and Output socket

• Channel Level control; from oo through 0dB to +15 dB

• Channel clipping indicator LED

• Channel Pan control

• Channel Auxiliary send

• Numbered marker panel for labelling DI assigns. Use grease pencil or

Rear Panel Connectors

• Channels 1-4 Balanced Outputs. Pin 2 + Hot, Pin 3 - Cold, Pin 1
Ground

• Channels 1-4 audio Ground lift switch

• Channels 1-4 Ground lift LED indicator

• Channels 1and 2 InThe Mix or DI only switches

• Aux out jack connector

DI-4 Application Notes

Setting up your DI-4 is very straightforward. It will accept virtually all High
Impedance (Hi Z) Unbalanced lines and convert them to Electronically
Balanced Low Impedance (Lo Z) lines, suitable for all professional audio
applications.

Simply choose a channel on the front, and turn the Gain control hard Left.
Plug your line into the Input, and your XLR lead into the corresponding
Output on the rear. Turn the channel Gain control up until the required
output level is reached. 0dB or Unity Gain is marked on the Gain control at
approximately 12 o’clock.

To reduce the signal level, turn to the Left; to increase it turn to the Right,
up to a maximum of +15dB. The Clip LED will light up if any part of the

Chinagraph type only. Do not use felt tip pens as these may perma­nently stain your front panel.

• Aux Send Master level control

• Left and Right Master level controls

• Left and Right Aux In jack connectors

• XLR Balanced Left and Right Master outputs. Pin 2 + Hot, Pin 3 ­Cold, Pin 1 Ground

• Unbalanced Left and Right jack Master output jacks

circuitry is being overloaded. If this occurs, reduce the Input level until it
stops. Use the audio Earth/Ground lift switch to eliminate Ground loop hum
if necessary.

If the Input signal needs to continue on to a musician’s individual amplifier,
for example Bass or Keyboards, insert a lead into the channel Output on the
front panel and run it to the amp.

The DI-4 also has a Mix function. This is especially useful for today’s multi­ple keyboards, drum machine, music computer set ups. Up to 4 individual
components can be plugged into the DI-4, and individual balanced lines can
be run down to the main console. A summed mix of these can be sent out to

DI-4 Owner's Manual v 2.2 CE ©2000 ARX® DI-4 Owner's Manual v 2.2 CE ©2000 ARX®4

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either the monitor console via the Master Balanced Outputs, or to the
musician’s personal amp via the Master Unbalanced Outputs, or both at the
same time if you wish.

If you are running short of channels to the main console, this summed mix
can be sent to the main console and the musician can balance the onstage
mix to their own taste.

The Aux send can either drive an effect or be used to generate a separate
mix.

The Left and Right Aux returns can either return the effect into the mix, or
bring a stereo tape or CD signal into the mix.

You don’t have to have all the channels in the mix. If you prefer to keep
some signals as Direct only, that’s no problem. On the rear panel, Channels
1 and 2 can be individually switched in or out of the mix as required.

The DI-4 is also ideal as a -10 dB to +4 dB level matcher for consumer audio
to pro audio, home studio equipment, and Audio for Video in discos and
clubs.

In Radio and TV broadcast work the DI-4 is a must in any remote truck, OB
van or mixing suite, being easily and quietly able to deliver the +8 dB or
greater line levels that are common to the industry. It will do this in DI
mode or Stereo Line mixer mode.

In short, the ARX DI-4 is a truly unique audio problem solver for all facets of
the audio industry, from Broadcast and Studio work through to Discos,
Clubs and Concert sound.

Being AC mains powered the DI-4 has no batteries to go flat, nor does it
require Phantom Power. However, many mixing console have Phantom
Power available to all channels or none, or to blocks of channels. If this is the
case, then the DI-4 will quite happily accept Phantom Power.

Special Note

Just two things the DI-4 won’t do (apart from make the coffee):

1. It is a Line Mixer, so it won’t accept Microphone level signals, and

2. It’s not designed to accept speaker level, so don’t plug the output of an
amplifier into it.

Introduction

Thank you for choosing this ARX DI-4. We hope you enjoy using this
unique product as much as we enjoyed creating it. As with all ARX equip­ment, it has undergone extensive factory testing and ‘burn in’ before ship­ping. To ensure continued trouble free use, please familiarise yourself with
the contents of this manual before using.

About the DI-4

ARX is proud to present another ‘must have’ product in its series of audio
toolboxes. The new DI-4 is a winning combination of four Direct boxes, and
a four channel stereo line mixer, with an Aux send and a stereo return.

The DI-4 has been designed to handle all signal interfacing requirements,
with unparalled ease of use and specifications.

Set it up any way you want; as Four individual DI units, as a Four into Two
line level mixer (at the same time!) or any combination of ins and outs that
you need.

On the front panel, each channel has two high impedance jack connectors.
The first is an input and the other is a looped high impedance output which
can go to an instrument amplifier if required. There is also a channel Gain
control, from infinity through to +15dB, enough Gain to drive the longest
lines, plus a Pan control for mixer applications.

A handy feature on each channel is the Aux send, which can either drive an
effect or be used to generate a separate mix.

The Left and Right Aux returns can either return the effect into the mix, or
bring a stereo tape or CD signal into the mix.

If you prefer to keep some signals as Direct only, that’s no problem for the
DI-4. On the rear panel, Channels 1 and 2 can be individually switched in or
out of the mix as required.

The rear panel also has the Balanced XLR outputs for Channels 1 to 4, each
with its own audio ground lift switch and status LED.The Aux send and Left
and Right Aux returns are jack connectors.

The stereo master outputs are both Balanced XLR and unbalanced Jack
connectors for maximum flexibility in operation.

In today’s competitive audio environment, every piece of equipment has to
earn its place in the rack. User friendly intuitive layout, plus precision
engineering and superb specs make the ARX DI-4 a ‘must have’ unit for any
sound system.

DI-4 Owner's Manual v 2.2 CE ©2000 ARX® DI-4 Owner's Manual v 2.2 CE ©2000 ARX®6

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