Four Channel Headphone Amplifier
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 trans i t. Us e
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 uni t in accordance with the instructions
printed in the user guide.
INTRODUCTION:
Thanks for purchasing Applied Research and
Technology’s DJ HeadAmp4. The HeadAmp4 is a
simple device which provides 4 channels of
amplification, each with individual volume controls
capable of directly driving up to 8 headsets
simultaneously.
FEATURES:
• 4 Output channels each with individual volume
control.
• Stereo 1/4" and 1/8" inputs (wired in parallel) can
be connected to any line-level source or headphone
output.
• Four stereo 1/4" and four 1/8" headphone outputs.
• Power "On” LED.
INSTALLATION:
Connect the included power adaptor to the HeadAmp4
input jack and plug the adaptor into an appropriate AC
power outlet.
Connect the stereo line-level output or headphone
output from the mixer, tape deck, CD player, another
headphone amplifier, etc. to the HeadAmp4 stereo input
using a low noise stereo T/R/S (Tip, Ring, Sleeve) patch
cord.
A Monaural source, such as a mixer's monitor output,
can be connected to the HweadAmp4 input by using a
mono T/S to stereo T/R/S patch cord or adaptor. (The
Stereo T/R/S plug would have the Tip and the Ring tied
together so that the same mono signal is input to both
the left and right channels,. With an unmodified stereo
cord attached, sound will be present in one ear only.
Connect the headphones to the output jacks and adjust
the controls as required.
APPLICATIONS:
Offering a superb level of The ARTcessories HeadAmp4
is a simple, cost effective solution for any studio
requiring up to four additional channels of headphone
amplification, each with individual volume control. Ideal
for virtually any home or project studio, the HeadAmp4
easily adds additional headphone outputs to any mixer,
computer audio interface, workstation, iPod, media
player or laptop without creating any additional load on
the existing headphone source. Capable of driving up to
eight sets of headphones using a combination of 1/4inch and 1/8-inch TRS connections, the HeadAmp4 can
easily accommodate a variety of headphone models
with varying impedances. With up to 20dB of additional
gain, input signals to the HeadAmp4 can be taken from
any line level or amplified headphone source.
The HeadAmp4 can even be driven from other
headphone amplifiers, including other HeadAmp4’s
when creating a multi-unit distribution network. Multiple
HeadAmp4’s can be connected to a single source using
the 1/4-inch and 1/8-inch TRS parallel inputs.
The HeadAmp4 is the ideal headphone distribution and
control solution for complex recording studio
environments, assisted listening systems, education
workstations and can easily be used as a stereo
distribution amplifier for commercial PA installations.
The compact stackable chassis design and all-metal
construction ensure long-term reliability and convenient
installation of the HeadAmp4 for use in any studio or
commercial audio application. soun d quality .
Signal Flow Chart
SPECIFICATIONS:
Maximum Input Level: +14dBu
Input Impedance: 90.9k Ohms
Maximum Output Level: +14dBu
Maximum Gain: 20dB
Output Impedance: 47 Ohms (each output)
Frequency Response: 20 - 20 kHz
S/N Ratio: > 90dB (ref 0dBu)
THD: < 0.01%
IMD (SMPTE): < 0.01%
Power: 12vDC (Adapter Included)
Dimensions HxWxD(in): 1.85 x 4.6 x 4.1
HxWxD(mm): 47 x 117 x 104
Weight(lbs/kg): 1.35 / 0.61kg
Note: 0dBu = 0.775Vrms
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., please
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.
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