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Average Price: $57

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Based on price data from 1 merchant for "Doepfer A-139-2 Headphone Amplifier". Prices shown reflect NEW condition. Tracking began Apr 19, 2026.

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Description

Elevate your sound experience with the Doepfer A-139-2 Headphone Amplifier, a sleek and efficient solution tailored for the discerning audiophile and musician. This Eurorack module is engineered to deliver pristine audio quality, making it an indispensable component for your modular synthesizer setup. Designed with 2 independent inputs, each with its own level control, the A-139-2 offers flexibility and precision in mixing. Whether you're in the studio or performing live, this amplifier ensures your headphones reproduce the nuances of your music with clarity and power.

One of the standout features is its normalizing function, where Input 1 is seamlessly connected to Input 2, allowing for versatile soundscaping options. The shared volume control further enhances the user experience by providing intuitive and straightforward adjustments. The result is an amplifier that not only supports but enhances your creative process, ensuring that your sound is as intended.

With a powerful output of approximately 2 watts per channel, the Doepfer A-139-2 is built to handle demanding auditory environments, ensuring robust sound reproduction without distortion. The 6.3 mm headphone output jack is designed for standard compatibility, making your setup as convenient as it is effective. Whether you're crafting new sounds or refining your tracks, this headphone amplifier is a reliable partner in your musical journey.

Key Features:

  • Eurorack module format
  • 2 inputs with separate level controls
  • Input 1 normalized to Input 2
  • Shared volume control for convenience
  • Headphone output with a 6.3 mm jack
  • Max output power of approximately 2W per channel (at 8 ohm load)

Product specs

Available since July 2015
Width 6 TE / HP

FAQs

What is the purpose of the Doepfer A-139-2 Headphone Amplifier in a modular synth setup?

The Doepfer A-139-2 Headphone Amplifier is designed to allow users to monitor audio directly from their modular synth system through headphones, providing a convenient way to listen without external speakers.

How many headphone outputs does the Doepfer A-139-2 have?

The Doepfer A-139-2 Headphone Amplifier features a single stereo headphone output, allowing users to connect one pair of headphones for monitoring purposes.

What is the width of the Doepfer A-139-2 Headphone Amplifier in a Eurorack setup?

The Doepfer A-139-2 Headphone Amplifier has a width of 6 TE/HP, making it a compact module suitable for most Eurorack systems.

Is the Doepfer A-139-2 Headphone Amplifier suitable for both stereo and mono signals?

Yes, the Doepfer A-139-2 can handle both stereo and mono signals, providing flexibility for different audio monitoring needs in a modular synth setup.

Reviews

PROS

  • Greater volume output compared to other Eurorack modules

  • Individual level controls for two audio inputs

  • Extremely low noise, neutral sound, HiFi quality

  • Handles higher input levels without distortion

  • Cost-effective solution for stereo output needs

  • Simple and reliable design, perfect for straightforward use

CONS

  • One amp IC may overheat, posing a risk of short circuit

  • Lacks shrouded headers on the power connector

  • Minimal noise filtering components, can be noisy

  • Build quality is acceptable but not exceptional

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Doepfer A-139-2 Headphone Amplifier.

Build quality

  • The A-139-2 uses TDA2030 14W Hi-Fi Audio Amplifiers, described as overpowered for typical eurorack setups, contributing to excess heat.

    Source

Features and functionality

  • The A-139-2 operates with a Class AB amplifier, which inherently wastes power, especially when driving low-power devices like recorders.

    Source
  • Input 1 on the A-139-2 is normalled to Input 2, allowing a single input to output the same audio to both headphone channels.

    Source
  • The A-139-2 is employed in setups where a modular system is used without traditional pedals, utilizing MIDI foot switches for signal routing between clean and effect paths.

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Setup and maintenance

  • Clipping can occur with both A-139-2 and A-138s when levels exceed 50-75%, necessitating careful level management.

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  • A cooling solution, like a PC fan connected to a 5V supply, can mitigate heat issues without introducing noticeable noise.

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  • Users caution against directly connecting headphones to modules like Mimeophon, suggesting that the A-139-2 provides a safer output stage for headphone use.

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Use cases and applications

  • The A-138s mixer can function as an output stage, provided levels are carefully managed to avoid clipping.

    Source
  • The A-135-1 VCA VCMixer can attenuate signals sufficiently to connect directly to speakers, reducing the need for an additional output module.

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  • The Doepfer A-139-2 is integrated into a bass looper/fx setup, paired with a Befaco Instrument Interface and Makenoise Mimeophon for enhanced bass practice and creative experimentation.

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  • Users recommend the A-139-2 for creating modular-based pedalboard setups, highlighting its utility in systems designed for bass guitars and other instruments.

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Value and pricing

  • Some users suggest investing in a cheap external mixer for better control over gain and pan, rather than solely using the A-139-2.

    Source

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