• Fully analog signal path for authentic tube sound
• high-quality transformers and premium tubes for precise and transparent compression
• Motorized controls for instant adjustments on the hardware device
• Remote control via VST3, AAX or AU plugin or standalone app
• Automations for attack, release, gain, Threshold and ratio in the DAW
• High-pass, band-pass and de-esser filters for targeted sound processing
• Modern power supply with voltage adjustment for maximum stability
• DC heating of the tubes to minimize background noise
• Wide frequency range from 20 Hz to 20 kHz with high precision
• Preset system for easy repetition of settings and A/B tests
• seamless integration with the optional A4 software suite for advanced features
• compact and robust design for professional studio environments

The A4-1B combines classic sound quality with modern efficiency and offers maximum flexibility for professional audio productions.

A4-1B analog Automated opto tube compressor

Combination of classic tube sound and modern precision

The A4-1B Tube-Optical Compressor combines the warmth of classic tube compression with the benefits of modern technology. Thanks to its fully analog signal path and high-quality components, it delivers precise and transparent compression while preserving the legendary Scandinavian sound character.

Advanced features such as DAW integration for remote control and automation as well as adjustable filters make it the ideal choice for professional audio productions.

Authentic analog sound quality
The fully analog signal path ensures the natural warmth and transparency of classic compression.

High-quality components
Special transformers and premium tubes ensure a tight bass response and high fidelity.

Remote control & automation
Thanks to proprietary motorized controls, settings can be adjusted and automated in real time via VST3, AAX or AU plug-ins.

Adjustable filters
High-pass, band-pass and de-esser modes enable targeted compression and precise sound processing.

Energy efficiency & stability
A modern power supply unit with automatic voltage adjustment ensures reliability and a long service life for the tubes.

Authentic sound, modern technology

The A4-1B is a tribute to classic opto-compression. The precise opto-cell technology and specially manufactured transformers guarantee unparalleled sound fidelity and depth. At the same time, modern functions such as DC heating, which brings the tubes to the perfect temperature, ensure reduced background noise and improved warmth in the sound.

Analog technology in the digital age

Theoptional A4 software suite seamlessly integrates the A4-1B into the digital audio world. Functions such as VST3, AAX or AU compatibility allow complete control directly from your DAW. Automations for parameters such as Attack, Release, Gain, Threshold and Ratio can be easily set up. A comprehensive preset function simplifies the workflow and ensures consistency between sessions.

Additional optional software

The optional A4 software suite offers one year's free access to Antelope Synergy Core Native plugins, updates and new releases.

The software is available by subscription and significantly extends the functionality of the A4-1B.