Antelope Audio A4-1B Analog Automated Opto Valve Compressor (Ultimate)

The Antelope Audio A4‐1B Ultimate Edition reimagines the iconic sound of vintage opto‐tube compression for the modern studio, merging true analog craftsmanship with state‐of‐the‐art automated control. Designed for engineers who demand both classic musicality and cutting‐edge workflow efficiency, it delivers the unmistakable warmth, smooth response and expressive dynamics that made optical valve compressors legendary.

At its core, the A4‐1B retains the soul of the original Danish opto‐tube architecture, offering rich harmonic depth, transparent gain reduction and effortless musical shaping across vocals, bass, keys and percussion. Even when pushed hard, the unit maintains clarity and detail, adding life and dimension without sacrificing precision.

What elevates the Ultimate Edition is its seamless hybrid workflow. The A4‐1B integrates directly with your DAW via the included VST3, AU and AAX plugin, enabling remote control, instant preset recall, session automation and perfectly matched stereo operation. The A4‐1B Ultimate is more than a compressor; it is a modern evolution of a studio classic, built for creators who want uncompromising analog tone with the convenience and precision of full digital integration.

If you're seeking a flagship opto‐valve compressor that bridges heritage and innovation, this unit stands in a class of its own.

Features

• Authentic opto‐valve compression with a 100 percent analog signal path
• Custom UK‐made transformers and premium hand‐selected tubes
• Pre‐sorted opto‐cell for precise, consistent compression
• Continuously variable ratio, attack and release controls
• Selectable fixed, manual and hybrid timing modes
• Modern low‐noise PSU with automatic voltage adaptation
• Automatic calibration system for long‐term accuracy and stereo linking
• VU meter with multiple reference levels
• Remote control and full DAW automation via VST3, AU and AAX plugin
• Instant hardware recall using proprietary motorised potentiometers
• Advanced sidechain filtering plus dedicated de‐essing mode
• Includes A4‐1B compressor, power cable, USB‐C cable and plugin license (Ultimate edition)