Pricing and availability

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Average Price: $11,741

High-end/Boutique

$100

$501+

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Budget

Standard

High-end

Price History

Based on price data from 4 merchants for "Undertone Audio UnFairchild Model 670M II". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

The Undertone Audio Unfairchild Model 670M II 2-Channel Tube Compressor / Limiter offers a harmonious blend of vintage warmth and modern precision, making it an essential tool for musicians and audio engineers seeking unparalleled sound control. Inspired by the legendary Fairchild 670, this compressor/limiter delivers a distinctive tonal character that's both rich and dynamic. Whether you're in the studio or on stage, its dual-channel design provides flexibility and detail, allowing you to sculpt your sound with ease and authenticity.

The Unfairchild 670M II is meticulously crafted to capture the essence of analog warmth while incorporating today's advanced technology. Its tube-driven circuitry ensures that every note resonates with clarity and depth, making it ideal for vocals, instruments, and mastering applications. Users will appreciate its intuitive interface, which allows for quick adjustments and fine-tuning, making it accessible for both seasoned professionals and those new to audio production. The robust build and sleek design also ensure that this unit will be a reliable companion for years to come.

Key Features:

  • Dual-channel design for versatile sound shaping
  • Tube-driven circuitry for vintage warmth and modern precision
  • Inspired by the iconic Fairchild 670 for a distinctive tonal character
  • Ideal for studio and live performance applications
  • Intuitive interface for easy adjustments and fine-tuning
  • Robust build for long-lasting reliability

Product specs

Brand Undertone Audio
Model Unfairchild Model 670M II 2-Channel Tube Compressor / Limiter
Finish Black
Year 2010s
Categories Compressors and Limiters

FAQs

What type of compression does the Undertone Audio UnFairchild 670M II utilize?

The Undertone Audio UnFairchild 670M II employs Fairchild-style compression, known for its smooth, musical response and rich tube warmth, making it ideal for mastering and critical mixing applications.

Is the Undertone Audio UnFairchild 670M II suitable for stereo applications?

Yes, the UnFairchild 670M II is a dual-channel tube compressor/limiter, making it well-suited for stereo processing and offering versatility in both mono and stereo applications.

What is the main function of the adjustable DC threshold on the UnFairchild 670M II?

The adjustable DC threshold on the UnFairchild 670M II allows users to fine-tune the compression threshold, providing greater control over the dynamics and the amount of compression applied to the audio signal.

How does the UnFairchild 670M II compare to the original Fairchild compressors?

The UnFairchild 670M II replicates the iconic sound of classic Fairchild compressors while incorporating modern features and reliability, offering the same rich, warm tube sound with enhanced functionality for today's studio environments.

What size rack does the Undertone Audio UnFairchild 670M II fit into?

The UnFairchild 670M II is designed to fit into a standard 19" rack-mount chassis, making it compatible with most professional studio rack setups.

MAKING RECORDS with ERIC VALENTINE

MAKING RECORDS with ERIC VALENTINE

Making Records with Eric Valentine - Undertone Audio UnFairchild 670M mkII

Video thumbnail for Making Records with Eric Valentine - Undertone Audio UnFairchild 670M mkII by MAKING RECORDS with ERIC VALENTINE

Making Records with Eric Valentine - Undertone Audio UnFairchild 670M mkII

MAKING RECORDS with ERIC VALENTINE

MAKING RECORDS with ERIC VALENTINE

Video thumbnail for Undertone Audio Unfairchild 670m II Hardware VS Plugin Emulation by Audio Animals Studio

Undertone Audio Unfairchild 670m II Hardware VS Plugin Emulation

Audio Animals Studio

Audio Animals Studio

Video thumbnail for Undertone Audio Unfairchild 670m II Analogue Compressor VS Plugin Emulation by Audio Animals Studio

Undertone Audio Unfairchild 670m II Analogue Compressor VS Plugin Emulation

Audio Animals Studio

Audio Animals Studio

Reviews

Critic Reviews

UnderTone Audio: UnFairchild 670M II Compressor | Tape Op Magazine | Longform candid interviews with music producers and audio engineers covering mixing, mastering, recording and music production.

tapeop.com

The UnFairchild 670M II dazzles with its vintage charm and modern flexibility, bringing the legendary Fairchild 670's magic to contemporary studios. Its dual-channel design, variable attack/release settings, and sidechain capabilities enhance creative options, making it a versatile tool for mixing. However, the nearly $10,000 price tag is a significant hurdle, prompting the reviewer to ponder life choices in its presence. While some might find the cost unjustifiable, those who can indulge will discover an enchanting compressor that feels like an instant classic, perfect for adding that special touch to any mix.

positive

4.5 out of 5

Based on 0 Reviews and 2 Ratings

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Artist usage

Add artist
See how Chris Chaney uses Undertone Audio UnFairchild Model 670M II

Chris Chaney

Bassist

AC/DC

...
Verified via YouTube

At 6:12 in the YouTube video "Chris Chaney and the 5088: Home Studio Tour" by Rupert Neve, bassist Chris Chaney is seen showcasing an Undertone Audio UnFairchild Model 670M II tube compressor in his studio rack.

See how Dave Clauss uses Undertone Audio UnFairchild Model 670M II

Dave Clauss

Audio Engineer

...
Verified via YouTube

In the video titled "Epic MIXING Home Studio Setup 2024 | Dave Clauss (studio tour)" by Andrew Masters on YouTube, an Undertone Audio UnFairchild Model 670M II Compressor is clearly visible at the 0:30 mark in the compressor rack to the right in Dave Clauss' mixing room.

See how Glenn Rosenstein uses Undertone Audio UnFairchild Model 670M II

Glenn Rosenstein

Guitarist, Music Producer

...
Verified via Glenn Rosenstein

According to his official website, music producer Glenn Rosenstein owns the UnderTone Audio Unfairchild 670M II Stereo Compressor/Limiters.

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Used With

Based on how musicians on Equipboard use Undertone Audio UnFairchild Model 670M II, it is most commonly used with the following gear.

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1 alternative for Undertone Audio UnFairchild Model 670M II, curated by the Equipboard community.

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$29,500.00 - $270,000.00

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