Doepfer A-143-9 QLFO

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$81.00 to $82.67 Price Tier: Budget

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Page last updated Jul 03, 2026

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5.0 (3)

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4.9 (29)

$82.00 $81.00 $1.00 · All time low

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Average Price: $82

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$149

$350+

Price Tier

In the Modular Synthesizers category, Doepfer A-143-9 QLFO 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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Description

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Elevate your modular synthesizer setup with the Doepfer A-143-9 QLFO, a versatile Quadrature LFO/VCO that offers a unique blend of functionality and creative potential. Designed for the Eurorack format, this module is both compact and powerful, making it an essential tool for sound designers and musicians alike.

The A-143-9 simultaneously generates sine and cosine signals, providing you with a rich sonic palette to explore. With its four outputs phase-shifted by 90 degrees, it offers a world of modulation possibilities, enabling complex audio and CV interactions. Whether you're crafting ambient textures or driving rhythmic sequences, the A-143-9 delivers the precision and flexibility you need.

Perfect for both live performances and studio sessions, this module is a reliable companion for musicians seeking to push the boundaries of sound design. Its intuitive interface ensures ease of use, while the robust construction guarantees durability, making it a worthy addition to any modular setup.

Key Features:

Simultaneously produces sine and cosine signals
4 outputs phase-shifted by 90 degrees
Eurorack format
Width: 8 HP
Depth: 50 mm
Power requirement: +30 mA (+12V) / -30 mA (-12V)

Product specs

Available since	May 2008
Width	8 TE / HP

FAQs

What type of modulation can the Doepfer A-143-9 QLFO provide?: The Doepfer A-143-9 QLFO is designed to provide quadrature low-frequency oscillations, ideal for modulating other modules with phase-shifted control voltages.
How does the Doepfer A-143-9 integrate with other modular synthesizers?: The Doepfer A-143-9 is compatible with Eurorack modular systems, allowing it to seamlessly integrate and modulate other modules within your setup.
Is the Doepfer A-143-9 QLFO suitable for beginners in modular synthesis?: Yes, the Doepfer A-143-9 is user-friendly and straightforward, making it suitable for beginners looking to explore modulation in modular synthesis.
What is the width of the Doepfer A-143-9 QLFO in a Eurorack setup?: The Doepfer A-143-9 QLFO has a width of 8 TE (HP), fitting comfortably within standard Eurorack cases.
Can the Doepfer A-143-9 QLFO be used to create complex modulations?: Yes, the Doepfer A-143-9 QLFO's quadrature outputs allow for complex modulations by providing multiple phase-shifted signals.

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Theremin test With Doepfer A-100 mini Theremin

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Reviews

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PROS

Delivers 4 sine waves, each 90 degrees phase-shifted
High-quality build typical of Doepfer
Two CV inputs, one with attenuation for added control
Flexible frequency range from 0.1 Hz to 3.5 KHz
Ideal for creating panning and phasing effects
Excellent for experimental FM sounds
Space-efficient design for modular racks
Affordable price point
Great for creating shepard’s tones and morphing soundscapes
Intuitive use with mults and attenuators for sound design

CONS

Lacks 1V/oct tracking for pitch accuracy
Considered slightly oversized by some users

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Doepfer A-143-9 QLFO.

Features and functionality

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The Doepfer A-143-9 provides a sine wave LFO and a 90º offset cosine, crucial for 3D video rotation effects.
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The A-143-9 isn't essential for inverted sine and cosine waves in video synthesis applications, simplifying requirements to just sine and cosine.
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Use cases and applications

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Owners utilize the A-143-9 in analog video synthesis to create rotating vector images for oscilloscopes.
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A-143-9's quadrature LFOs are preferred for Eurorack video modules like the Rotator by Elliott Art, enhancing video synthesis capabilities.
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Software and compatibility

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The Doepfer A-143-9's compatibility with other systems is highlighted by its ability to work with DAW-generated sine and cosine waves through conversion modules.
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