Antelope Audio A4-1B Analog Automated Opto Valve Compressor

Analog Tube Compression with Modern Automation
The Antelope A4-1B Opto Valve Compressor is a professional-grade outboard unit designed to deliver the warm, musical character of classic optical tube compression while providing the precision, speed, and workflow enhancements of digital control. Its fully analog audio path ensures the authentic sound engineers demand, with premium tubes and custom UK-made transformers adding rich harmonic detail and smooth dynamics to vocals, bass, keys, and percussion.

Premium Analog Components for Authentic Sound Quality
Built to exacting standards, the A4-1B features a 100% analog signal path using top-tier components. Custom UK-designed transformers offer tight, controlled low-end and clear, open highs. High-quality tubes bring organic warmth and depth to every track. A hand-selected opto-cell ensures precise, transparent compression behavior, faithfully replicating the character of iconic Scandinavian opto compressors revered in professional studios.

Seamless Digital Control for Workflow Efficiency
While its sound is purely analog, the A4-1B offers full digital automation for unmatched ease of use. Proprietary motorized potentiometers instantly recall saved settings, controlled either directly or via software integration. The A4 control panel, available as a VST3, AU, or AAX plugin, allows real-time adjustments and DAW automation of key parameters like Attack, Release, Gain, Threshold, and Ratio. A comprehensive preset system ensures quick recall and reliable A/B comparisons.

Advanced Filtering and Vocal Processing Tools Built-In
Going beyond standard compression, the A4-1B features an extended filter section with high-pass, low-pass, and band-pass options for targeted sidechain compression. A dedicated de-essing mode with narrow band-pass filtering efficiently tames vocal sibilance and resonances. These precision tools are invaluable for mixing engineers needing fine control over complex audio material.

Precision Calibration Systems for Long-Term Reliability
The A4-1B is equipped with automated calibration features to maintain consistent performance over time. Its Opto-Cell Test System and self-calibrating VU meters ensure accurate metering and stereo matching. The power supply includes automatic voltage adaptation, enhancing stability and reducing unwanted noise, while DC tube heating further minimizes hum for pristine sound quality.

A Fully Integrated Solution for Modern Studio Setups
Whether working in a hybrid analog-digital studio or a fully in-the-box environment, the A4-1B integrates effortlessly. Its software interface offers streamlined control, bridging the gap between hands-on hardware operation and digital precision. The unit ships with a complimentary one-year Synergy Core Native membership, providing access to a wide range of premium plugins and software updates, ensuring your setup stays current.

A Legacy Reimagined with Cutting-Edge Automation
The Antelope A4-1B stands as a modern reimagining of classic optical compression, delivering timeless analog warmth with the convenience and accuracy of digital control. With its blend of heritage design and forward-thinking features, it’s an essential addition for professional producers and engineers seeking authentic sound with modern workflow enhancements.