DOEPFER A-105-4 Quad Poly Ssi Vcf Modular Eurorack Demo Circuit

( Brand: Doepfer ), ( Model: A-105-4 QUAD POLY SSI VCF ), ( Type: Modular Synthesizer ), ( Manufacturer Part Number: A-105-4 )

Review DOEPFER Quad Poly Ssi Vcf Modular Eurorack Demo Perfect Circuit

The Doepfer A-105-4 Quad Poly SSI VCF Modular Eurorack Demo Circuit is a versatile and powerful voltage-controlled filter solution designed for use in Eurorack modular synthesizer systems. This module offers four independently controlled VCF channels, each based on the legendary Sallen-Key Second Order Self-Oscillating (SSI) topology.

The core of each VCF channel is a 4-pole low-pass filter, which can be switched to a 12-dB/octave high-pass or band-pass configuration. The filter's resonance can be modulated via an external CV input, allowing for expressive and dynamic filter sweeps. Additionally, each channel features an independent VCF input and a dedicated envelope follower input.

The envelope follower is a critical component of the A-105-4, allowing it to generate filtered envelope shapes from external voltage sources. It can be used to create complex filter modulation sequences or to trigger self-oscillation in the VCF. Each envelope follower offers an adjustable attack, decay, and release time, providing fine control over the shape and character of the envelope.

The A-105-4 features a robust and user-friendly design, with all essential controls and connections conveniently located on the front panel. Each channel is color-coded to simplify identification and routing, and the module's layout ensures that all connections can be easily accessed.

Furthermore, the A-105-4 is a complete demo circuit, meaning it includes a complete power supply and a set of patch cables. This allows users to begin exploring the module's capabilities right out of the box, without the need for additional components.

In summary, the Doepfer A-105-4 Quad Poly SSI VCF Modular Eurorack Demo Circuit is a versatile and powerful voltage-controlled filter solution that offers four independently controlled channels, each with SSI VCF technology, adjustable envelope followers, and various filter modes. Its user-friendly design, complete power supply, and patch cables make it an excellent starting point for those new to modular synthesis or an essential addition to any established Eurorack system.

The Doepfer A-105-4 Quad Poly SSI VCF modular eurorack module is a versatile and powerful voltage-controlled filter (VCF) solution for your modular synthesizer system. Here are some pros and cons that may help you in making an informed decision about purchasing this module.

1. Quad VCF design: The A-105-4 offers four independent VCF channels in a single module, making it an excellent choice for complex filtering tasks and polyphonic synthesis.

2. State-Variable Filter: This module implements the classic SSI2140 State-Variable Filter design, offering a wide range of filtering capabilities, including low-pass, high-pass, band-pass, and notch filtering.

3. Flexible modulation options: The A-105-4 includes an envelope follower, a voltage-controlled amplifier (VCA), and a low-frequency oscillator (LFO), providing ample modulation sources for creating intricate and expressive filtering effects.

4. CV compatibility: The module accepts control voltages (CV) for filter frequency, resonance, and envelope generation, allowing for dynamic and expressive performances.

5. Eurorack standard: The A-105-4 is a eurorack-format module, making it compatible with most other eurorack gear and easy to integrate into a modular synthesizer setup.

6. Durable construction: The module is built with high-quality components and robust construction, ensuring reliable performance and long-term use.

1. Power consumption: As with many eurorack modules, the A-105-4 draws a significant amount of power, requiring a dedicated power supply to ensure stable operation.

2. Size: With its quad VCF design and various built-in features, the A-105-4 is a relatively large module, which may limit the number of other modules you can fit into your eurorack case.

3. Complexity: The A-105-4 is a versatile and powerful module, which can make it somewhat challenging for beginners to fully understand and utilize all of its features.

4. Price: The Doepfer A-105-4 is a professional-grade module, and as such, it comes with a higher price tag compared to some other VCF options on the market.

The Doepfer A-105-4 Quad Poly SSI VCF modular eurorack module is an excellent choice for those seeking a versatile and powerful filtering solution for their modular synthesizer system. Its quad VCF design, comprehensive modulation options, and SSI2140 State-Variable Filter design offer a wide range of filtering capabilities and expressive control. While its size, power consumption, complexity, and price may be drawbacks for some, the A-105-4's robust construction, durability, and professional-grade performance make it a worthwhile investment for serious modular synthesists.

If you're in the market for a high-quality, versatile VCF module for your modular synthesizer system, the Doepfer A-105-4 Quad Poly SSI VCF modular eurorack module is an excellent choice. Its comprehensive feature set, robust construction, and professional-grade performance make it an essential addition to any serious modular setup. However, be prepared for the module's size, power consumption, complexity, and higher price point. If these factors are a concern, consider exploring alternative VCF options that may better suit your needs and budget.

part # a1054 prices

• $225.00-$305.00

specifications synthesasha:

• brand: Doepfer
• model#: A-105-4 QUAD POLY SSI VCF
• type: Modular Synthesizer
• manufacturer part number: A-105-4

seller synthesasha:

• # reviews: 50116
• rating: 99.5%

shipping synthesasha:

• cost: $0.00
• transit: 4-8 Days
• type: Fixed
• service: Standard
• class: Standard

offer synthesasha:

• sold: 0
• quantity: 1
• started: January 19, 2026
• options: Ship-to-home
• availability: In Stock

returns synthesasha:

• paid by: Buyer
• policy: Returns Accepted
• time: 30 Days
• method: Money back

general synthesasha:

• condition: Open box
• Musical Instruments Gear > Pro Audio Equipment > Synthesizers

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• credit card: Diners-club
• other
• wallet: Apple-pay

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