Doepfer A-138m Matrix Mixer

$144.00 to $207.00 Price Tier: Standard

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Page last updated Jul 04, 2026

Pricing and availability

We compare 600+ stores and found this item at 3 stores. Prices updated July 3, 2026.

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Price

$207.00

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$148.41 4 available New

$125.51 3 available Used

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4.8 (26)

$145.00 $144.00 $1.00 · All time low

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Average Price: $156

Standard/Professional

$149

$350+

Price Tier

In the Modular Synthesizers category, Doepfer A-138m Matrix Mixer is priced in the Standard/Professional range. This is quality gear at a fair price point, suitable for beginners, hobbyists, and pros alike.

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Price History

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Description

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Unlock a world of creative possibilities with the Doepfer A-138m Matrix Mixer, an essential addition to any modular synthesizer rig. This versatile 4x4 matrix mixer seamlessly integrates with your Eurorack system, offering a DC coupled design that allows for both audio and control voltage (CV) processing. The Doepfer A-138m is designed for the experimental musician, enabling you to craft intricate feedback loops, manipulate modulation sources, or simply mix audio signals with ease.

Each of the four columns is equipped with a switchable unipolar/bipolar mode, giving you the flexibility to shape your sound precisely to your liking. Additionally, the top row's DC offset control (which can be disabled if needed) provides extra versatility for scaling sequences or enhancing voltages. This feature is a favorite among synth enthusiasts who enjoy pushing the boundaries of their sound.

Whether you're diving into textural soundscapes, experimenting with LFOs, or managing complex signal routing, the Doepfer A-138m Matrix Mixer is a reliable and flexible tool that enhances your modular setup without overwhelming it. Its intuitive layout and robust build make it a perfect choice for both studio work and live performance.

Key Features:

4x4 matrix mixer for flexible signal routing
DC coupled for compatibility with audio and CV signals
Switchable unipolar/bipolar operation on each column
Top row offers optional DC offset control
Compact design with 20HP width and 20mm depth
Power consumption: +30mA @ +12V; -30mA @ -12V

Product specs

Type	Mixer Eurorack Module
Depth	0.78" (20mm)
HP Size	20HP
Power Usage	±12V/30mA
Power Supply	Requires Eurorack case and power supply

FAQs

What is the primary function of the Doepfer A-138m Matrix Mixer?: The Doepfer A-138m Matrix Mixer allows you to route multiple audio signals to different outputs, creating custom mixes. It's ideal for modular synth setups where flexible signal routing is needed.
How many inputs and outputs does the Doepfer A-138m Matrix Mixer have?: The Doepfer A-138m Matrix Mixer features four inputs and four outputs, enabling complex routing possibilities within a modular synth system.
What are the power requirements for the Doepfer A-138m Matrix Mixer?: The Doepfer A-138m requires a Eurorack case with a power supply, operating at ±12V and consuming 30mA.
Can the Doepfer A-138m Matrix Mixer be used with other Eurorack modules?: Yes, the Doepfer A-138m is designed to be compatible with other Eurorack modules, making it a versatile addition to any modular setup.
What is the size of the Doepfer A-138m Matrix Mixer in HP?: The Doepfer A-138m Matrix Mixer occupies 20HP in a Eurorack case.

Videos

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Eurorack mixer doepfer A-138m matrix mixer demo

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doepfer a -138 m matrix mixer |sequence demo

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Reviews

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PROS

Functions as mixer for audio and CV signals
Can be turned into a 4 step chord sequencer
Usable as a 16 step traditional sequencer with additional modules
Offers a range of functions: sends/returns, attenuverters, feedback mixer
Acts as a modulation matrix and performance controller
Provides versatility at a low price

CONS

Achieving absolute 0 volts in bipolar mode is difficult
Some signal bleed may occur, which can be occasionally annoying

Owner Insights

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

Setup and maintenance

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If experiencing noise issues, inspect the power supply connection and consider replacing the chips if used, as improper power can damage components.
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Test the power pins on the sockets to ensure correct power delivery; replace electrolytic capacitors if necessary to resolve audio quality problems.
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Features and functionality

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A scratchy top mix control can degrade sound quality, especially if set past noon or at minimum, causing overall poor audio.
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The Doepfer A-138m is noted for its straightforward 4x4 matrix setup, providing reliable Doepfer quality with no additional features like mutes or faders.
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User experience

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Used units may have been mistreated; check for signs of power reversal or damaged components, which can lead to sound quality issues.
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High pitch whine and signal bleed from power supply are common issues when overloading the uZeus power supply.
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Comparisons

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Compared to the AI Synthesis Matrix Mixer, the Doepfer A-138m is larger but offers more channels, whereas the AI Synthesis is compact at 10hp and DC-coupled for mixing audio and CV.
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While the 4ms VCA Matrix offers varied output routing, the Doepfer A-138m is highlighted for its straightforward functionality without VCA control, appealing to users preferring simplicity.
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Use cases and applications

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Users appreciate the Doepfer A-138m for its no-fuss operation, making it ideal for those who prioritize simplicity and reliability over advanced features.
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The Doepfer A-138m is favored for creative patching, such as feedback loops and mixing drones, offering flexibility beyond simple voice combination.
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Some users prefer the Doepfer A-138m in studio settings for individual element recording to DAW, rather than live performance setups.
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Build quality

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Despite the Doepfer A-138m's size, it's been highlighted for its ergonomic design, making it a preferred choice over smaller matrix mixers with less user-friendly layouts.
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Value and pricing

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The Doepfer A-138m is praised for its affordability, especially when compared to high-end options like the Erica Matrix, which offers extensive connectivity at a higher price point.
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