The Future of Analog Gear
A4-1B combines the legendary sound and design of analog Opto-Tube compressor with modern-day workflow enhancements. Experience its signature hardware audio processing or take it a step further by accessing an array of contemporary functionalities.
As authentic as it gets.
A4-1B was designed to preserve vintage Opto-Tube units' highly praised smoothness and musicality. Even when pushed to the limit, the compressor remains transparent, breathing new life into vocal tracks, bass, keys, or percussion. A4-1B sounds and reacts just like the legendary hardware that inspired it allowing you to apply the legendary sound of Opto-Valve compression to your modern production.
Revolutionized Analog Power
High-quality components ensure A4-1B's superior sound and performance consistency across the whole frequency spectrum. Accurate circuit topology meticulously recreates the architecture of the legendary Danish opto-tube design for truly authentic analog compression. This all-analog powerhouse was made to last and faithfully follow the legacy it was built upon.
Custom UK-made transformers
The custom input and output transformers give this compressor a tight, punchy low-end and beautifully detailed highs, adding warmth and character, bringing out rich harmonics without sacrificing clarity.
A4 1B Vacuum Tube
Hand-picked premium tubes
The signature sound of this unit comes from its premium tubes, giving it a rich, musical character, adding that unmistakable analog warmth while maintaining precision and clarity.
A4 1B Connections
Revolutionized modern PSU
Electricity is the heart and soul of high-end analog gear so we added an efficient, modern PSU with advanced automatic voltage adaptation for greater stability and noise reduction, that also provides DC heating to the tubes for a smoother warm-up
A4 1B Control panel screenshot
Calibrated to perfection.
Among the many stand-out features of А4-1B are its calibration systems. A built-in Opto-Cell Test System ensures consistent compression and long-term reliability, even after decades of work. This automatic calibration shines the most when two units are used for stereo link or when you recall presets even years later.
