ART Pro Audio DUALZDirect User Manual

Dual Channel Passive Direct Box

Artcessories

User's Manual

IMPORTANT SAFETY INSTRUCTION – READ FIRST

This symbol, whenever it appears,
alerts you to the presence of
uninsulated dangerous voltage
inside enclosure-voltage that may be
sufficient to constitute risk of shock.

Read Instructions: Retain safety and operating instructions for
future reference. Heed all warnings printed here and on the
equipment. Follow the operating instructions printed in this us er
guide.

Do not open: There are no user serviceable parts inside. Refer
any service work to qualified technical personnel only.

Grounding: Only connect the unit to equipment with properly
grounded mains power. Do not defeat the grounding and
polarization means of the power cord plug of the connected
equipment. Do not remove or tamper with the ground
connection on the power cord of the connected equipment.

Environment: Protect from excessive dirt, dust, heat, and
vibration when operating and stori ng. Avoid tobacco as h, drink
spillage and smoke, especially that associated with smoke
machines.

Handling: Protect the controls from damage during t rans i t. Use
adequate padding if you need to ship the unit. To avoid injury to
yourself or damage to the equipment, take care when lifting,
moving or carrying the unit.

Servicing: Refer servicing to qualified technical personnel.

This symbol, whenever it appears,
alerts you to important operating
and maintenance instructions in
the accompanying literature.
Please read the manual.

Installation: Install the unit in accordance with the instructions
printed in the user guide.

INTRODUCTION:

Thanks for purchasing Applied Research and
Technology’s DUALZDirect. The DUALZDirect provides
two independent high quality totally passive interfaces
that let you connect instrument, line, or speaker level
signals to a mixer or other balanced inputs through high
performance audio isolation transformers. Each of the
high impedance single-ended 1/4” inputs is converted by
a transformer into an isolated, balanced, low impedance
signal output. The DUALZDirect's audio transformers
have an extremely flat and wide frequency response
and can handle high signal levels. This gives the
DUALZDirect a very clean and neutral sound with a
wide variety of signal sources and over long signal runs
in high noise environments.

The input ATTENUATOR switches allow for a wide
range of signal levels and the input THRU jacks allows
for tapping off of your signal chain. The GROUND LIFT
switches let you totally separate the input and output
signal grounds, when appropriate, to isolate two
systems, thereby reducing hum and ground-loop noise.

What further sets the DUALZDirect apart from other “DI”
boxes are its extended features and versatility. We have
added switchable low pass FILTERs that cut out all very
high frequency interference. These Bessel filters on the
outputs are placed out of the audio range and are

primarily intended to reduce radio frequency
interference before it gets into the main system. The
filters are also very effective in reducing any digital
computer noise artifacts when using the DUALZDirect
as an interface between a computer-based audio
workstation and your monitors. The PHASE INVERT
switches, while not normally included with your "run of
the mill" DI box, have been added to allow you to switch
signal polarity right at the source. This feature is
especially handy when you are combining a direct tap
with a microphone feed in the mix.

The compact black-anodized all aluminum case and it’s
passive design allow the DUALZDirect to provide years
of trouble free service in Live Sound, Permanent/Fixed
Install, D.J., and virtually any PA application. It’s full
feature set, rugged construction, and high-end
specifications make the DUALZDirect the obvious
choice.

FEATURES:

• Fully passive, high performance transformer design.
No battery required.

• Converts 50k Ohm inputs into 600 Ohm balanced
outputs

• Switchable input attenuation (0, -20, -40 dB)
Switchable low pass filter

• Switchable phase invert

• Switchable ground lift (fully isolates inputs from

chassis and outputs)

• XLR connectors for balanced outputs

• Rugged extruded aluminum case

INSTALLATION and OPERATION:

1. Connect your instrument, line, or speaker level

signal to either of the INPUT 1 or 2 1/4" TRS phone
jacks. Connect one end of a phone jack cable to the
corresponding THRU 1/4' TRS phone jack and the other
end to where your signal was going to, if connecting the
DUALZDirect inline in the signal path. Repeat for the
other INPUT and THRU jacks if desired.

2. Connect a balanced line cable between the

corresponding OUTPUT 1 or 2 male XLR connector on
the rear panel and the balanced inputs of your audio
gear. Repeat for the other OUTPUT if desired.

3. Set the input ATTENUATOR switches for best

signal strength and clarity. Select the FILTER if desired
(it won't affect normal audio frequencies). Select the
GROUND LIFT feature to lower hum and other ground
loop noise, if present. The PHASE INVERT feature may
be used to correct phase error problems elsewhere in
the audio system.

Signal Flow Chart

SPECIFICATIONS:

Frequency Response: 10 Hz - 50 kHz, ± 0.5

dB @ +4 dBu
THD: .01% typical @ 1 kHz,
+18 dBu
<.05% @ 100 Hz,
+18 dBu

Channel Separation: > 80 dB (typical)
Input Connections: 1/4" TRS unbalanced

(2), 50k Ohm

Thru Connections: 1/4" TRS (2)
Output Connections: XLR male balanced

(2),600 Ohm
Input Attenuation: Switchable, (0 -20,

-40 dB)

Filter Type / Response: Switchable, low pass,

-3 dB @ 30 kHz

Dimensions HxWxD (in): 1.85 x 4.6 x 3.9
HxWxD (mm): 47 x 117 x 99
Weight (lbs/kg ): 0.88 / 0.40

WARRANTY INFORMATION:

Limited Warranty (USA only)

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. Applied Research and
Technology will, without charge, repair or replace, at its
option, defective product or component parts upon
prepaid delivery 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, defaced, or removed.
ART 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 manufactured.
ART 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. The warranty terms listed
above are only valid within the United States of America.
For units purchased outside the United States, an
authorized distributor of Applied Research and
Technology will provide service. For information on
warranty and service policies outside of the U.S., ple ase
contact your local distributor.

Please fill in the following information for your reference:

Date of purchase: _________________________
Purchased from: _________________________

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. Select "Support", then

"Return Authorization Request" to request a return
authorization number.

3. If you are returning the unit for service, pack the
unit in its original carton or a reasonable substitute.
The original packaging may not be suitable as a
shipping carton, so consider putting 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.

4. Include with your unit: a note with the RA number
and your contact information, including a return
shipping address (we cannot ship to a P.O. box)
and a daytime phone number, and a description of
the problem, preferably attached to the top of the
unit. Also include a copy of your purchase receipt.