Inofficial: (A-70) vintage Fairchild 670, (A-27) homebrew Fairchild 627 equalizer, (A-64) vintage Fairchild 664 equalizer and (A-58) Fairchild model 658 Reverbertron Spring Reverb
The Holy Grail of Tube Compression
Ultramarine 4 is a high-fidelity recreation of the most legendary compressor ever made: the Fairchild 670. Known for its massive price tag and its incredible weight of 60+ lbs in real life, the Fairchild is the definition of "vintage tube mojo." Ultramarine captures the soul of this beast, providing a level of harmonic richness that is unparalleled.
Key Features
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A-670 Vari-Mu Compression: Replicates the complex tube interaction of the original hardware. It doesn't just compress; it enhances the signal with a lush, three-dimensional character.
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Rare Passive EQ: Includes sampled units from the same era, allowing you to shape your tone with the same velvety smoothness found on classic 1950s and 60s recordings.
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Total Control: Features modern additions like a side-chain filter, dry/wet mix, and Mid-Side processing—features the original 1950s engineers could only dream of.
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Hyper Tech Precision: Powered by Acustica’s latest engine, ensuring the complex harmonic distortion and timing constants of the tubes are modeled with extreme accuracy.
Best Used For
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Vocals: To get that classic, smooth, "hugged" vocal sound that sits perfectly in a mix.
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Drum Bus: It is famous for making drums sound "huge" and explosive (the "Beatles" drum sound).
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Master Bus: To add a final layer of analog warmth and harmonic cohesion to a digital production.
Pro Tip: Use Ultramarine on your vocal bus. Even if the gain reduction needle is barely moving, the tube saturation from the preamp stage alone will make the vocals feel more tangible and "expensive."
Company: Acustica Audio