ART HeadAMP 4 Manual
PDF manual · 14 Pages
English
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Frequently Asked Questions
The HeadAMP 4 offers stereo 1/4" and 1/8" inputs wired in parallel and four 1/4" plus four 1/8" stereo headphone outputs, allowing multiple headphones to be connected and driven from a single stereo source.
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Using the combination of 1/4" and 1/8" outputs, the HeadAMP 4 can accommodate up to eight sets of headphones simultaneously, with each of the four channels having its own volume control.
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Yes. A mono source can be connected using a mono T/S to stereo T/R/S adapter or cable that ties tip and ring so the same mono signal is sent to both left and right channels; otherwise an unmodified stereo cable may only play in one ear.
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Important specs include frequency response of 20 Hz–20 kHz, maximum input/output level of +14 dBu, maximum gain of 20 dB, output impedance of 47 ohms, S/N ratio >90 dB, and THD <0.01%.
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Yes. Multiple HeadAMP 4 units or other headphone amplifiers can be driven from a single source by using the parallel 1/4" and 1/8" inputs to create an expanded distribution network for larger setups.
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The unit uses a 12V DC power adapter, which is included. Ensure the adapter is connected to an appropriate AC outlet and do not tamper with grounding or polarity safety measures of connected equipment.
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In the United States the HeadAMP 4 carries a three-year limited warranty covering defects in workmanship and materials; exclusions apply for misuse, unauthorized repairs, and altered serial numbers. Outside the U.S., warranty service is handled by authorized local distributors.
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Advantages and Disadvantages
Advantages
- Four independent volume-controlled channels for individual monitoring.
- Supports both 1/4" and 1/8" TRS inputs and outputs for flexible connectivity.
- Up to 20 dB gain lets the unit accept line-level and amplified headphone sources.
- Compact, stackable all-metal chassis provides durability and easy installation.
- Can drive up to eight headphones when using both jack types simultaneously.
Disadvantages
- Output impedance of 47 ohms may not be optimal for very low-impedance studio headphones.
- No built-in EQ or advanced routing—basic monitoring functionality only.
- Requires external 12V DC adapter; no internal battery option.
- Limited to four channels per unit; larger setups require multiple units.
- Warranty service terms vary by region; U.S. warranty is three years, others via distributors.
Product Description
ART HeadAMP 4 Overview
The ART HeadAMP 4 is a compact, four-channel headphone amplifier designed for studios, classrooms, and live environments that need reliable headphone distribution with individual channel control. Each of the four channels has its own volume control and can drive up to eight headsets using a combination of 1/4" and 1/8" TRS outputs, making it a versatile solution for small group monitoring and multi-user listening setups.
Key Features and Use Cases
This unit accepts stereo 1/4" and 1/8" inputs wired in parallel, allowing easy connection to mixers, audio interfaces, CD players, laptops, or other headphone outputs. Inputs tolerate line-level sources and amplified headphone outputs, and the HeadAMP 4 offers up to 20 dB of gain to boost quieter sources. Its four stereo 1/4" and four 1/8" headphone jacks let users connect a variety of headphone models and impedances without overloading the source.
The HeadAMP 4 is ideal for home and project studios, assisted listening systems, education workstations, and small commercial PA distribution tasks. Units can be daisy-chained (multiple HeadAMP 4s or other headphone amps) for expanded distribution. The compact, stackable all-metal chassis ensures durability and convenient rack or desktop placement.
Installation and Operation
Setup is straightforward: connect the included 12V DC adapter, route a stereo TRS cable from your source to the HeadAMP 4 input, plug headphones into outputs, and adjust individual volume controls. A mono source can be adapted to stereo by tying tip and ring so both ears receive the same signal. The front-panel power LED indicates unit status.
Technical Highlights
With a frequency response spanning 20 Hz–20 kHz, output impedance of 47 ohms per output, input impedance around 90.9k ohms, and a signal-to-noise ratio exceeding 90 dB, the HeadAMP 4 delivers clean, low-distortion monitoring (THD < 0.01%). Maximum input and output levels are +14 dBu, and the unit is lightweight and portable (approximately 1.35 lb / 0.61 kg).
Notes
- Includes a 12 V DC adapter.
- Can drive up to eight headphones using both jack sizes.
- Stackable, all-metal chassis for durability.
- Ideal for expanding headphone outputs without loading the source.
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