Cwejman S1 MK2

$7,595.35 Price Tier: High-end

5.0 (1)

1 Critic Review

1 Review

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Page last updated Jun 11, 2026

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$7,595.35 1 available Used

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Average Price: $7,595

High-end/Boutique

$149

$350+

Price Tier

In the Modular Synthesizers category, Cwejman S1 MK2 is priced in the High-end/Boutique range. This premium gear is built to very high standards and offers premium features.

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High-end

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Description

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Experience the power of analog synthesis with the Cwejman S1 MK2, a versatile modular synthesizer that continues to captivate sound designers and musicians around the world. This semi-modular beast blends the flexibility of patching with the stability of a hardwired signal path, offering the best of both worlds. Its all-analog signal path ensures that the sound is rich, warm, and full-bodied, making it a favorite for those who crave authentic analog tones.

The S1 MK2 is equipped with three high-quality oscillators, providing a wide range of sonic possibilities from deep basses to soaring leads. Its multimode filters grant precise control over your sound, allowing you to sculpt tones with surgical precision. The onboard envelopes and LFOs offer extensive modulation capabilities, making complex sound design both intuitive and inspiring.

Whether you're crafting intricate patches or performing live, the S1 MK2's robust interface and build quality ensure reliability and ease of use. It seamlessly integrates with your existing modular setup while still standing strong as a standalone unit, ideal for both studio and stage environments.

Key Features:

Three voltage-controlled oscillators with multiple waveforms
Multimode filter with low-pass, band-pass, and high-pass options
Dual ADSR envelopes for dynamic sound shaping
Multiple LFOs for advanced modulation
Extensive patching capabilities with semi-modular design
Analog signal path for authentic sound quality
Compatible with other modular systems

Product specs

Brand	Cwejman
Model	S1 MK2 Semi-Modular Monophonic Analog Synthesizer
Finish	Eggshell, Grey
Year	2000s
Made In	Sweden
Categories	Analog Synths, Rackmount Synths
Analog / Digital	Analog
MIDI I/O	MIDI Input
Polyphony	1 Voice

FAQs

Is the Cwejman S1 MK2 suitable for beginners in modular synthesis?: The Cwejman S1 MK2 is a semi-modular analog synthesizer that offers a deep and flexible sound design experience, which may be complex for beginners. However, it is a great choice for those with some synthesis knowledge looking to explore modular synthesis.
What type of synthesis does the Cwejman S1 MK2 use?: The Cwejman S1 MK2 is an analog synthesizer, utilizing true analog circuitry to produce rich and warm sounds characteristic of classic analog synths.
Can the Cwejman S1 MK2 be integrated into a MIDI setup?: Yes, the Cwejman S1 MK2 features MIDI input, allowing it to be controlled via MIDI devices and easily integrated into a MIDI setup.
What are the standout features of the Cwejman S1 MK2's sound engine?: The Cwejman S1 MK2 is known for its versatile sound engine, offering multiple oscillators, filters, and modulation options, allowing for a wide range of sound creation from deep basses to intricate leads.
Does the Cwejman S1 MK2 require external patch cables to function?: As a semi-modular synthesizer, the Cwejman S1 MK2 does not require external patch cables for basic functionality, but patching can expand its capabilities and sound design options.

Videos

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sonicstate

FIVE MINUTES WITH Cwejman S1 MKII Synthesizer System

sonicstate

Cwejman S1 mk2 - Melancholic distorted chord drone

kapillarkraft

Cwejman S1 MK2 First Jam

Animato Audio

Depressed Synthesis Tutorial featuring Cwejman S1 Mk2

environnyc

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Cwejman S1 MK2.

Features and functionality

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The S1 MK2's combination of 3 VCOs, dual multimode filters, and multiple waveforms is highlighted for its complex sound design potential.
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S1 MK2 is praised for delivering precise pitch tracking and rich sound due to its varied waveforms, though it may lack extensive modulation capabilities.
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The S1 MK2 includes a multimode second filter, offering extensive routing possibilities not available in the SM-1.
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The S1 MK2 offers CV control of individual envelope parameters, a rare feature that enhances modulation possibilities.
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User experience

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Owners who prioritize precision and reliability in professional settings often value Cwejman for its consistent performance.
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Owners have noted that treating synths with care, such as the MS-20 mini, ensures longevity despite concerns about parts quality.
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Owners often describe the S1 MK2's dual-filter design as offering significant sound shaping capabilities, making it a favorite for complex patches.
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Use cases and applications

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The DFA-2 module can produce kicks that reveal deficiencies in audio setups, highlighting its utility in precision sound design.
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The SM-1 integrates well into rack-mounted setups, while the S1 MK2 is better suited for desktop use due to its form factor.
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Value and pricing

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Cwejman modules are considered overpriced by some due to their rarity and small production runs, not necessarily their functionality.
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Despite its high cost, some users consider the S1 MK2 a timeless piece worth the investment for its unique sound capabilities.
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Comparisons

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Intellijel Cascadia is noted as a more reasonably priced alternative to Cwejman, offering premium modular qualities without the high cost.
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Analog Solutions Vostok is mentioned as a contemporary of the S1 MK2 but with distinct differences in functionality.
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The RSF Kobol Expanders are noted for VC envelopes and resonance CV, coming close to the S1 MK2's capabilities.
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The S1 MK2 provides an additional oscillator compared to the SM-1, which may enhance sound design flexibility.
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Setup and maintenance

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Cwejman modules use SMT circuitry, making them difficult to service without access to original schematics, which are not widely available.
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Build quality

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Known for high-quality construction, Cwejman modules feature exceptionally stable oscillators and robust knobs, enhancing their reputation for durability and precision.
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Some users suggest the mini versions of synths like the MS-20 mini may have noisier components than full-size versions, despite similar sound quality.
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Critic Reviews

Cwejman Sound S1 MkII

soundonsound.com

The Cwejman S1 MK2 is a masterclass in semi-modular synthesis, offering an astounding range of sounds and flexibility that few can match. Its precision and sonic clarity make it a standout choice for serious synthesists. Though the MIDI programming is cumbersome and the documentation could be improved, its robust engineering and expansive sound palette justify its premium price. If you can afford it, the S1 MK2 is likely to be a coveted addition to your setup. However, be prepared for a steep learning curve and the need for additional mixers and multiples to unlock its full potential.

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michael_pohl

over 10 years ago

Very strong sounding machine ...

Very strong sounding machine with precise behaviour, superfast to superslow envelopes. More possibilities than one would expect. It surprises even after long years of use. Can sound like other vintage synths or completely unique. All purpose weapon! Some say it's sound is kind of cold, but actually it depends on your settings. It can indeed sound extremely warm, phat and rich. At lower levels you get a very raspy oscillator sound which beats Sequential's Pro One. The filters are superb but in some cases I would like them to open up even more than up to 16kHz. With a little bit of resonance you get that effect though and can emulate a SH2 behaviour.