Using the DI-PLUS
The DI-PLUS is a Direct Injection, or
Direct, box. It is a self contained,
stand alone stereo unit designed to
interface unbalanced high impedance
lines with professional balanced low
impedance inputs. In other words, it
will convert an ordinary signal into
one that is happy to travel down a
long line and meet a mixing console
at the other end. It has many appli-
cations for Live Sound, Studio or
Broadcast use.
Typical uses are:
• Musical instruments - Bass guitar,
normal guitar, synthesizers, elec-
tronic drums, drum machines
• Consumer audio products - CD
players, cassette decks, tape decks,
video cassette audio, computers.
Operating instructions
Normal Connection
Power Requirements
The DI-PLUS is an active device,
ie.
it needs power to run. This power
can be supplied 2 ways:
• Battery power.
The DI-PLUS has provision for 1 x
9 volt battery internally. To get to
the battery compartment, unscrew
the knurled captive bolt on the rear
panel, and push the top part of the
chassis upwards and backwards.
The battery compartment will im-
mediately be visible. Remove the
old battery, replace with a new 9v
alkaline battery and close the lid.
To obtain warranty service for your DI-
PLU
, call or write to
ARX or the dealer you purchased it from. They will give
you the correct address to send your unit to. Have your sales
receipt showing date of purchase handy, and include a copy
with your DI-
PLUS
. Pack the unit well - we are not respon-
sible for damage caused by unsuitable packing during ship-
ment. Send the unit to us pre-paid, by a delivery service
like FedEx, UPS, or any other service that can track the
shipment. We will return it to you freight paid.
If you have any questions, or any part of this is unclear, please
write to ARX Systems in the country of purchase, or to the
address below.
PO Box 15, Moorabbin, Victoria 3189, Australia.
Phone: +61 (0)3 9555 7859 Fax: +61 (0)3 9555 6747
You can also Email the factory at:
Page 7
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ARX Systems (ARX) warrants to the first purchaser of this DI-PLUS
that it is free from defects in materials and workmanship under nor-
mal use and service. ARX’s sole obligation under this warranty shall
be to provide, without charge, parts and labour necessary to rem-
edy defects, if any, which appear within twelve (12) months from
date of purchase; and to supply parts only for the life of the product
to the original purchaser.
This is our sole warranty. It does not cover finish or appearance items,
nor does it apply if the DI-PLUS 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 otherwise than in accord-
ance with the instructions supplied by ARX.
This warranty gives you and us specific legal rights, and you may also
have other rights which can vary from state to state.
INTERNATIONAL LIFETIME WARRANTY
Max Input Level
+13 dB Phantom powered
+6 dB Battery powered
Input Impedance
1 Meg Ohm
Max Output Level
+17 dB 10K Ohm load Phantom powered
+12 dB 10K Ohm load Battery powered
+11 dB 600 Ohm load Phantom powered
+12 dB 600 Ohm load Battery powered
Output Impedance
680 Ohms Balanced
Output Signal to Noise
-100 dB unweighted
-104 dB A weighted
Dynamic Range
117 dB 10K Ohm load Phantom powered
112 dB 10K Ohm load Battery powered
111 dB 600 Ohm load Phantom powered
107.5 dB 600 Ohm load Battery powered
Distortion
100 Hz .0027%
1KHz
.0028%
10KHz .0037%
Frequency Response
20Hz to 20KHz, ± 0.2 dB
Gain through Unit
6dB (Normal Input, Pad switch out)
Pad Switch
-20 dB attenuation
Speaker Input
-40dB attenuation, equivalent to 100:1 decrease in
input level; -60db atten. available with Pad switch
Input and Loop Out Connectors
Insulated jack
Output Connector
3 pin XLR. Wired Pin 1 Ground, Pin 2 +Hot, Pin 3 -
Cold. Global Audio Ground (Pin 1) lift switch
Construction
All-steel chassis, fibreglass PCB
Battery Access
Twist connector opens chassis, snap-in
battery holder inside. No tools required
then connect a lead from the Loop
Out to the amplifier. Pushing the Pad
switch IN will reduce the input level
by -20dB if required.
Special Note. The DI-PLUS is a Line
level device, so it is not designed to
accept Microphone level signals.
Connection from Amplifier
For applications where the sound of
the instrument/amplifier combination
is required, connect a lead from
theAux (or External) speaker output
on the rear of the amplifier to the
Speaker Level Input (-40dB) on the
DI-PLUS. If the signal is still too hot,
then switch the PAD switch in as well
to reduce the input by a further -20dB.
Note:
Be sure to always use the
Aux
or
External
speaker output on the
amplifier.
Never
disconnect the
speakers on a valve/tube amplifier.
Output Connections
Specifications
As well as the DI Plus and the DI
Plus2, ARX manufacture a six chan-
nel rack mount AC powered Direct
box:
The
DI-6s
is a 19” 1 RU AC pow-
ered unit that has 6 independent Di-
rect boxes, each with high imped-
ance Input and Loop out jack con-
nectors, a oo to +15dB level con-
trol, clip LED, balanced XLR output
and individual audio ground lift
switches. It can also function as a 6
into 1 line mixer
at the same time
.
A switch on the rear changes it from
a 6 into 1 mixer to a 1 into 6 line
distribution splitter, each split’s level
controlled by the six individual chan-
nel controls.
A true Pro Audio toolbox!
Did you know...
1
2
3
Plug a jack lead with a high imped-
ance source (instrument, unbalanced
lines or similar) into the Normal In-
put. This will turn the unit on and a
balanced signal will appear at the XLR
Balanced Output on the rear of the
unit. This connects to the Input of the
mixing console. If the signal needs
monitoring, eg. an onstage amplifier,
Re-tighten the bolt finger tight only.
That’s all there is to it. No tools, no
screwdrivers required!
•
Phantom power.
The DI-PLUS will also run on Phan-
tom power if available on the mix-
ing console. Switch the Phantom
power ON on the channel the DI-
PLUS is plugged into, and the Red
Phantom power LED will light up on
the DI-PLUS. This means the DI-
PLUS is now running on the Phan-
tom power and the batteries are dis-
engaged. If you switch the Phantom
power off the DI-PLUS will revert to
battery operation, although we rec-
ommend using Phantom Power if
available as it gives an approx 6dB in-
crease in overall headroom
(see
Specifications, p 4).
Connect a balanced microphone lead
from the 3 pin XLR connector on the
rear of the DI-
PLUS
to an input chan-
nels on the mixing console. Pushing
the Audio Ground Lift switch IN will
isolate the Pin 1 output of the DI-
PLUS
to stop Ground Loops if required.