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Mos-lab 904-B

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Page last updated Aug 11, 2025

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Step into the world of classic analog sound with the Mos-lab 904-B, a quintessential addition to any modular synthesizer setup. This module pays homage to the iconic low-pass filter design that defined the sound of a generation. Perfect for both purists and those new to modular synthesis, the 904-B is crafted to deliver the warm, rich tones that analog enthusiasts crave.

With its authentic Moog ladder filter circuit, the 904-B allows you to sculpt your sound with precision and depth, offering a frequency response that ranges from lush basses to shimmering highs. The module’s high-quality components ensure that your sound is not only true to the original but also reliable for live performance and studio work.

Whether you're exploring new sonic territories or recreating the vintage sounds of the past, the Mos-lab 904-B stands as a testament to the enduring appeal of analog synthesis. Its straightforward interface makes it accessible for beginners while providing the complexity that seasoned pros demand.

Key Features:

Classic Moog ladder filter circuit
Authentic low-pass filter design
Wide frequency response range
High-quality components for reliable performance
Ideal for live performance and studio use
Compatible with a variety of modular systems

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MOS-LAB

Mos-Lab 904-B vs Moog 904-B.mpg

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We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Mos-lab 904-B.

Features and functionality

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MOS-Lab 904-B offers a faithful Moog high pass filter clone, crucial for creating bandpass filter effects when combined with a low pass filter.
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Comparisons

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MOS-Lab modules in the .com/MU format deliver a more authentic Moog sound compared to Eurorack alternatives, which can be more expensive for similar quality.
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User experience

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MOS-Lab's larger jacks and knobs are preferred for ease of use, enhancing the modular experience compared to the smaller Eurorack format.
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Use cases and applications

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The combination of MOS-Lab 904-A and 904-B filters allows for versatile sound shaping, from classic Moog tones to experimental sounds.
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Mods and upgrades

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Incorporating MOS-Lab 904-B into a setup with multiple oscillators and FM Aids can emulate smoother Yamaha DX-7-like tones, expanding sound variety.
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Value and pricing

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For the authentic Moog sound on a budget, MOS-Lab offers a cost-effective alternative to original Moog modular systems.
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Junkie XL

Composer, Music Producer

Tiësto vs. Junkie XL

Verified via reverb.com

Listed on Reverb.com in November 2020.

This mos-lab 904-B is owned by Junkie XL

This unit was one of many that made up Toms impressive 5U modular synth wall. All of his gear was professionally maintained and cleaned on a regular basis. This module is in very good cosmetic shape and is fully functional.

All items in The Official Junkie XL Reverb Shop ship fully insured with delivery confirmation. COA's were limited to the first 500 orders so unfortunately we do not have anymore.