Antelope Audio A4-1B Opto Valve Compressor

The Antelope Audio A4‐1B brings the timeless sound of classic opto‐tube compression into the modern studio, combining authentic analog circuitry with advanced workflow features.

Designed to capture the smoothness and musicality of vintage units, it delivers transparent, expressive compression that enhances vocals, bass, keyboards and percussion with unmistakable warmth and character. Even under heavy gain reduction, the A4‐1B maintains clarity, depth and definition, making it a versatile tool for both mixing and tracking.

Inside the unit, meticulous analog design ensures premium performance across the full frequency spectrum. Custom UK‐made input and output transformers provide tight, punchy lows and detailed highs, enriching harmonic content without sacrificing accuracy. Hand‐selected tubes deliver the signature tonal warmth, while an advanced power supply with automatic voltage adaptation reduces noise and ensures long‐term stability.

Beyond its analog heritage, the A4‐1B introduces a new era of hybrid hardware. A dedicated plugin (VST3, AU and AAX) offers remote control, instant preset recall, DAW automation and seamless integration into digital, analog or hybrid setups.

If you're looking to elevate your sound with authentic analog character and modern flexibility, the A4‐1B is well worth exploring.

Features

• Classic compression sound
• Plugin control with presets and automation
• Automatic calibration systems
• Pristine analog signal path
• Proprietary motorised potentiometers
• Sidechain filtering with de‐essing