Doepfer A-103 18db Filter

$85.00 to $115.00 Price Tier: Budget

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Page last updated Jul 23, 2026

Pricing and availability

We compare 600+ stores and found this item at 3 stores. Prices updated July 23, 2026.

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$115.00

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$87.25 2 available New

$83.29 1 available Used

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4.5 (29)

$86.00 $85.00 $1.00 · All time low

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Average Price: $93

Budget/Beginner

$149

$350+

Price Tier

In the Modular Synthesizers category, Doepfer A-103 18db Filter 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

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Description

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The Doepfer A-103 18db Filter brings the unmistakable charm of classic analog sound into your modular setup. This voltage-controlled low-pass filter, inspired by the legendary TB-303, offers an 18dB/octave slope, delivering that distinct, resonant sound that has been a staple in electronic music. Designed for those who appreciate both simplicity and functionality, the A-103 uses a modified transistor ladder circuit, ensuring rich, warm tones that are perfect for acid basslines and creamy leads.

Compact yet powerful, this module occupies a mere 8HP in your Eurorack case, making it an ideal addition for those looking to maximize their sonic palette without sacrificing space. The filter’s layout is intuitive, with familiar CV-controlled parameters that allow effortless sound shaping. Whether you're a seasoned synth enthusiast or a newcomer exploring the modular world, the A-103 offers a seamless integration into your existing setup and a straightforward approach to complex sound design.

Key Features:

18 dB/octave low-pass filter slope
Based on the classic transistor ladder design
TB-303 inspired sound characteristics
Compact 8HP width for Eurorack systems
CV inputs with attenuators for dynamic control
Intuitive interface for easy sound manipulation

Product specs

Type	Low Pass Filter Eurorack Module
Controls	Frequency Cut-off, CV Attenuator, Audio Attenuator, Resonance
Depth	2.16" (55mm)
HP Size	8HP
Power Supply	Requires Eurorack case and power supply

FAQs

What is the function of the Doepfer A-103 18dB Low Pass Filter in a modular synth setup?: The Doepfer A-103 is a low pass filter module designed to remove high frequencies from an audio signal, allowing you to shape and sculpt sounds within a modular synthesizer setup.
How does the resonance control affect the sound of the Doepfer A-103 filter?: The resonance control on the Doepfer A-103 allows you to emphasize frequencies around the cut-off point, creating a pronounced peak that can enhance or alter the character of the sound.
What are the power requirements for the Doepfer A-103 18dB Low Pass Filter?: The Doepfer A-103 requires a Eurorack case with a compatible power supply to operate, as it is a Eurorack module designed for integration into modular synthesizer systems.
How wide is the Doepfer A-103 module in HP size?: The Doepfer A-103 module is 8HP wide, making it a compact addition to your Eurorack setup.
Can the Doepfer A-103 filter be used to process external audio signals?: Yes, the Doepfer A-103 can process external audio signals, allowing you to filter and modify sounds from other sources within your modular setup.

Videos

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Zoë Blade

Doepfer filter comparison / shootout

Zoë Blade

Doepfer A-103

MrHasardos

Doepfer Dark Energy / Dark Trilogy with A-103 and A-108 (303 and Moog filter)

creativegallerysynth

Quick modular acid test

darenager

Doepfer A-103 vs Verbos Foundation Oscillator

BOΞ_DYΞ

Reviews

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PROS

TB-303 filter clone offers characteristic acid sound
Versatile for both acid lines and a variety of synth sounds
Comparatively affordable within the eurorack filter market
High build quality from Doepfer
Features 3 CV inputs for enhanced control
Encourages experimental use beyond its intended design
Can produce unique sounds, like emulating a Jew's harp
Performs well with both high and moderate resonance settings
Self-oscillates pleasingly at high frequencies
Handles mixer output well, offering clear sound quality

CONS

Doesn't fully replicate the TB-303's filter range
Sound consistency varies with patching skill
Self-oscillation is limited to higher frequencies

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Doepfer A-103 18db Filter.

Comparisons

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The A-103 filter is often favored over more expensive options like Moog's due to its unique 18db slope, offering a more aggressive sound than the 12db Wasp filter.
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Unlike the 24db Moog filter, the A-103 retains more high frequencies during sweeps, providing a unique sound profile with a watery, chirpy resonance.
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The Doepfer A-103-6 is favorably mentioned for its versatility in creating acid sounds, with users comparing its performance positively against other options like Polivoks and Ripples.
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Owners note the Doepfer A-103 outputs smoother signals compared to AJH Minomod filters when both are fully open with zero resonance.
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Features and functionality

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The A-103 offers a progressive overdrive on the output stage, controlled by a level knob, allowing dynamic interaction with input signals above 60% on a 5v p-p oscillator.
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The A-103-6's 18db slope offers a distinctive acid sound, differentiating it from more common 24db filters and making it a preferred choice for unique tonal character.
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The A-103 can overdrive with the level knob maxed, despite being labeled as an "attenuator" in the manual, which some users found misleading.
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Build quality

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Despite initial perceptions of being "cheap," the A-103 features consistent build quality, with durable knobs that maintain a pleasant tactile feel over time.
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User experience

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Owners frequently use the A-103 over other filters like Morgasmatron and Ripples, especially for stereo programs and drum overdrive, highlighting its versatility and preference in patches.
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Users appreciate the A-103-6 for its ability to maintain low-end frequencies while providing a squelchy, resonant character, which is particularly valued in acid music contexts.
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Users discovered that the A-103 can smooth out signals even when fully open, though this effect is inaudible in practical use.
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Value and pricing

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At $109, the A-103 is considered a valuable workhorse for both beginners and experienced users, often staying in collections due to its utility and affordability.
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Use cases and applications

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The A-103-6 is highlighted for its effectiveness in stereo setups, providing a unique acid sound profile suitable for both mono and stereo configurations.
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Setup and maintenance

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The A-103 filter may exhibit unexpected clipping; users recommend checking the level knob settings to avoid unintentional overdrive.
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Other

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The A-103's output distortion can be managed by adjusting the level control, which some users initially misunderstood due to language differences in the manual.
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