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Doepfer A-138s Mini Stereo Mixer

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$77.00 to $78.61 Price Tier: Budget

5.0 (1)

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Page last updated Jul 04, 2026

Pricing and availability

We compare 600+ stores and found this item at 2 stores. Prices updated July 4, 2026.

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5.0 (4)

$78.61 7 available New

$67.00 3 available Used

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4.7 (87)

$77.00

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Average Price: $74

Budget/Beginner

$149

$350+

Price Tier

In the Modular Synthesizers category, Doepfer A-138s Mini Stereo Mixer is priced in the Budget/Beginner range. This is great gear to get started with or for creators on a budget.

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Price History

Based on price data from 1 merchant for "Doepfer A-138s Mini Stereo Mixer". Prices shown reflect NEW condition. Tracking began Apr 25, 2026.

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Description

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Compact yet powerful, the Doepfer A-138s Mini Stereo Mixer is a versatile addition to any modular synthesizer setup. Designed to fit comfortably within the Eurorack format, this 4-in-2 mix module comes loaded with features that make it a must-have for musicians seeking precise audio control. Whether you're layering complex synth sounds or balancing live inputs, this mini mixer delivers impeccable precision with its four inputs, each equipped with an attenuator and pan control.

Despite its small footprint, the A-138s doesn't skimp on functionality. The dual 3.5 mm mini jack outputs ensure seamless connectivity with other gear, making it an ideal choice for both studio sessions and live performances. Its intuitive layout allows for quick adjustments on the fly, putting you in complete control of your soundscape. Plus, with its efficient power requirements, it's easy on your system's resources, ensuring you have more room for creativity.

Key Features:

4-in-2 mix module in Eurorack format
Four inputs with individual attenuator and pan control
Two 3.5 mm mini jack outputs
Width: 8 HP
Depth: 30 mm
Power requirements: +10 mA (+12 V) / -10 mA (-12 V)

Product specs

Available since	July 2017
Modul Type	Stereo
Width	8 TE / HP

FAQs

What is the primary function of the Doepfer A-138s Mini Stereo Mixer?: The Doepfer A-138s Mini Stereo Mixer is designed to mix stereo audio signals within a modular synthesizer setup, providing control over volume levels for each input channel.
How many input channels does the Doepfer A-138s Mini Stereo Mixer have?: The Doepfer A-138s Mini Stereo Mixer features four stereo input channels, allowing you to mix multiple stereo audio sources simultaneously.
What is the width of the Doepfer A-138s Mini Stereo Mixer in a modular setup?: The Doepfer A-138s Mini Stereo Mixer has a width of 8 HP (horizontal pitch), making it a compact choice for modular synthesizer systems.
Is the Doepfer A-138s Mini Stereo Mixer suitable for live performance setups?: Yes, the Doepfer A-138s Mini Stereo Mixer is suitable for live performance setups due to its compact size and ability to handle multiple stereo audio inputs efficiently.
Can the Doepfer A-138s Mini Stereo Mixer be used in both mono and stereo configurations?: The Doepfer A-138s Mini Stereo Mixer is specifically designed for stereo configurations, providing optimal performance when mixing stereo audio signals.

Videos

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Morten GIUFJ Sønderup

Dreadbox Nostalgia/ Doepfer A-138s Stereo Mixer Demo

Morten GIUFJ Sønderup

Superbooth 2017: Introducing Doepfer New Modules and the Performance Mixer

Analogue Zone Showroom / Synths and Studio

Reviews

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PROS

Good price for its functionality
Compact size, easy to integrate without feeling cramped
Stereo capability enhances performance routing flexibility
Mixes both CV and audio signals effectively
Offers additional gain beyond unity mixing
High-quality pots with a musical taper
Solid build and reliable performance
Ideal for both audio and CV mixing

CONS

Sound quality slightly softer than direct signals
Presence can be audibly detected in the signal path
Panning knobs lack a central stabilizer for precise positioning

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Doepfer A-138s Mini Stereo Mixer.

Features and functionality

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The Doepfer A-138s is appreciated for its compact size, making it ideal for sub-mixes and busses in modular setups.
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While the A-138s lacks LED indicators, it remains a popular choice among users seeking simplicity and effective stereo mixing.
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The A-138s lacks beefy output amps, unlike the A-139-2, reducing heat issues in compact eurorack setups.
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Comparisons

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Some users prefer the Doepfer A-138s over more expensive mixers, like those priced around $300, due to its satisfactory clarity and performance.
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The Roland 531 mixer was considered for its CV panning capabilities, but users seeking minimal features and direct stereo busses often choose the A-138s.
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The Doepfer A-139-2 uses TDA2030 amplifiers, which are overpowered for direct recording purposes, making the A-138s a more appropriate choice for such setups.
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User experience

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A user reported using the A-138s as an attenuator/CV mixer by dedicating one channel to audio and another to CV, highlighting its versatility.
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Build quality

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The A-138s, being a newer model, doesn't seem to have the older issues of cheap op amps found in previous Doepfer mixers.
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The Doepfer A-138s can clip at high levels even at the lowest input setting on multi-track recorders, requiring careful volume management.
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Use cases and applications

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Owners use the A-138s as an output stage directly into recording devices like the Zoom H4n, emphasizing the need for level attenuation to avoid damage.
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Artist usage

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Afterlife

Music Producer

Verified via Facebook

In a studio tour video posted on Facebook, Steve Miller, known as Afterlife, showcases his collection of instruments, including a Doepfer A-138s Mini Stereo Mixer.