ART HeadAmp4
Four Channel Headphone Amplifier
Important Safety Instructions
⚠ This symbol, whenever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure – voltage that may be sufficient to constitute a risk of shock.
⚠ This symbol, whenever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. Please read the manual.
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 user 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 storing. Avoid tobacco ash, drink spillage, and smoke, especially that associated with smoke machines.
Handling
Protect the controls from damage during transit. 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.
Installation
Install the unit in accordance with the instructions printed in the user guide.
Introduction
Thank you for purchasing the ART HeadAmp4. The HeadAmp4 is a simple device that 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 adapter to the HeadAmp4 input jack and plug the adapter into an appropriate AC power outlet.
Connect the stereo line-level output or headphone output from your 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 HeadAmp4 input by using a mono T/S to stereo T/R/S patch cord or adapter. 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
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. It is ideal for virtually any home or project studio, easily adding headphone outputs to any mixer, computer audio interface, workstation, iPod, media player, or laptop without creating additional load on the existing headphone source.
Capable of driving up to eight sets of headphones using a combination of 1/4-inch and 1/8-inch TRS connections, the HeadAmp4 can accommodate a variety of headphone models with varying impedances. With up to 20dB of additional gain, input signals can be taken from any line-level or amplified headphone source.
The HeadAmp4 can also be driven from other headphone amplifiers, including other HeadAmp4 units when creating a multi-unit distribution network. Multiple HeadAmp4 units can be connected to a single source using the 1/4-inch and 1/8-inch TRS parallel inputs.
The HeadAmp4 is an ideal headphone distribution and control solution for complex recording studio environments, assisted listening systems, and education workstations. It can also 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 for use in any studio or commercial audio application.
Signal Flow Chart
The signal flow chart illustrates how the input signal is distributed to the four independent headphone amplifier channels. A single input (1/4" or 1/8") is fed into the unit, and this signal is then split and sent to each of the four amplifier channels. Each channel has its own output, supporting both 1/4" and 1/8" headphone connections.
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): 1.85 x 4.6 x 4.1 inches (47 x 117 x 104 mm)
- Weight: 1.35 lbs / 0.61 kg
- 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 its components will be free from defects in workmanship and materials for a period of three years from the date of purchase. ART 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 improvements upon this product without obligation to install them on previously manufactured products.
ART shall not be liable for any consequential damages, including 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 the U.S., please contact your local distributor.
For Your Reference
Date of purchase: _________________________
Purchased from: _________________________
Service
The following information is provided in the unlikely event that your unit requires service:
- Be sure that the unit is the cause of the problem. Check that the unit has power supplied, all cables are connected correctly, and the cables themselves are in working condition. Consult your dealer for assistance in troubleshooting or testing your particular configuration.
- If you believe the ART unit is at fault, visit www.artproaudio.com. Select "Support", then "Return Authorization Request" to request a return authorization number.
- If returning the unit for service, pack it in its original carton or a reasonable substitute. The original packaging may not be suitable as a shipping carton, so consider placing 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.
- 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.
