Antelope Audio A4-1B Opto Valve Compressor

Vintage Analog Compression with Digital Automation Precision
The Antelope Audio A4-1B Analog Automated Opto Valve Compressor blends the unmistakable warmth of classic tube compression with advanced digital automation for seamless integration into any modern studio workflow. With a 100% analog signal path built from premium tubes and UK-made transformers, it delivers rich harmonic detail, tight low-end response, and transparent dynamic control. Perfect for vocals, instruments, and mix buses, the A4-1B adds authentic analog character while providing digital convenience like recallable presets and DAW automation.

High-End Analog Circuitry for Authentic Sound Quality
At the core of the A4-1B is a meticulously designed analog circuit that ensures sonic excellence. Carefully selected tubes inject smooth, musical saturation, while custom UK transformers provide clarity and depth across the frequency spectrum. A hand-matched opto-cell guarantees precise compression behavior, faithfully replicating the response of renowned Scandinavian optical compressors. This combination of craftsmanship and premium components delivers superior audio performance with true analog warmth.

Motorized Automation and Full DAW Integration for Streamlined Workflow
While the audio path remains purely analog, the A4-1B incorporates motorized potentiometers that enable precise automation and instant preset recall. Its integration with Antelope’s A4 Analog Automation Control plugin allows users to adjust parameters like Attack, Release, Gain, Threshold, and Ratio directly from their DAW. This digital control ensures efficient session workflows and consistent results, making the A4-1B a powerful addition to hybrid studio setups.

Advanced Sidechain Filtering and De-Essing for Precision Dynamics Control
The A4-1B is equipped with an extended filter section that includes high-pass, low-pass, and band-pass filters for targeted sidechain compression. A specialized de-essing mode using a narrow band-pass filter effectively controls sibilance in vocal tracks. These advanced dynamics tools offer precise shaping and control, making the A4-1B a versatile solution for engineers seeking accuracy and flexibility in their mixes.

Automated Calibration Systems for Reliable Long-Term Performance
To ensure consistent operation and maintain audio integrity over time, the A4-1B features automated calibration systems. The Opto-Cell Test System and self-adjusting VU meters guarantee accurate metering and stereo matching. Its robust power supply offers automatic voltage adaptation and DC tube heating to reduce hum and enhance stability, ensuring the unit performs reliably in demanding professional environments.

Bundled Software Suite with Expansive Plugin Access
Every A4-1B unit comes with a complimentary one-year Synergy Core Native membership, providing access to a comprehensive library of premium plugins and software updates. This bundle expands the A4-1B’s capabilities, ensuring users stay equipped with cutting-edge tools for audio production. The optional A4 software suite offers extended control, allowing seamless operation via standalone application or DAW integration for complete flexibility.

Engineered for Professionals Who Demand Analog Warmth and Modern Control
The Antelope A4-1B is the perfect solution for audio engineers and producers seeking the sonic richness of true analog compression with the precision and workflow enhancements of digital automation. Its meticulous design, premium components, and forward-thinking features bridge the gap between vintage analog warmth and contemporary studio needs, making it an indispensable tool for modern music production.