Antelope Audio A4-1B Opto Valve Compressor
Compressor with DAW Control
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Want to Click and Collect or try items at our Guildford Store?
The store is open 10am - 6pm Monday to Saturday and 11am - 5pm Sunday and bank holidays.
The stock information shows the quantity of units that are available to purchase at the Guildford store and the quantity of units that are available at our off-site Guildford warehouse. These stock levels are updated in real time.
Our Click and Collect service is available at our Guildford store from 10am - 6pm Monday to Saturday, and 11am - 5pm on Sunday. You can either choose click and collect as your delivery option online or, during store opening hours, call our sales team at 01483 456777 to place a 10% deposit.
If you have placed your order online, you will receive a confirmation email of your order and a separate follow-up text or email to confirm when your item is ready for collection.
Please do not come to the store before you have received the follow-up message, as your order may not yet be ready at the store.
If the only available stock is in our off-site warehouse it can be brought to the store location for you to try - you just need to contact the store within opening hours. Please note any requests received after 3.30pm will not arrive at the store until the following morning.
Please be aware that, unless you have paid a deposit to reserve the item, it will continue to be free, both online and in-store, for another customer to buy. Therefore we would advise you to place a 10% deposit by either using the on-line click and collect service or calling us 01483 456777.
SKU: A41B
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Product Description
The A4-1B compressor is a groundbreaking fusion of vintage analogue warmth and modern digital convenience. Inspired by the legendary Opto-Tube designs, it offers classic smooth and musical compression that enhances vocals, bass, keys, and percussion with a transparent yet characterful sound. Built with high-quality components including custom UK-made transformers and hand-picked premium tubes, the A4-1B delivers rich harmonics and clarity across the entire frequency spectrum. Beyond its authentic analogue signal path, the unit introduces advanced workflow enhancements such as automatic calibration systems and proprietary motorised potentiometers. These features allow for fast preset recall, remote control, and seamless automation integration via its dedicated plugin, compatible with all major DAWs. With sidechain filtering and de-essing included in the plugin, the A4-1B bridges the gap between classic analogue tone and the demands of modern music production, making it an essential tool for producers seeking the best of both worlds.
Key Features:
- Authentic Analogue Opto-Tube Compression:
Preserves the smooth, musical character of vintage hardware while maintaining transparency and clarity even under heavy compression. - Proprietary Motorised Potentiometers:
Allows instant preset recall and remote control with tactile hardware feel and fast, precise response between digital and analogue controls. - Advanced Calibration and Automation:
Includes automatic calibration for consistent compression, stereo linking, and full plugin automation for attack, release, gain, threshold, and ratio.
Revolutionary Analogue Sound and Build Quality:
The A4-1B is built to faithfully replicate the iconic Danish opto-tube compression architecture using premium, hand-selected tubes and custom transformers from the UK. Its analogue circuitry delivers a punchy low end and detailed highs, adding warmth and character without sacrificing clarity. The robust, modern power supply ensures stability, low noise, and smooth tube warm-up with advanced voltage adaptation, guaranteeing reliability and consistent performance over many years.
Seamless Digital Integration and Workflow Enhancements:
Designed for the contemporary studio, the A4-1B includes a versatile plugin that integrates effortlessly with any DAW. The plugin supports presets, instant recall, A/B comparisons, and full automation of compressor parameters. This combination of analogue sound with digital convenience provides a smooth workflow, allowing users to switch settings on the fly and automate compression dynamically, making it perfect for both traditional and hybrid studio setups.
Flexible Filtering and Sidechain Capabilities:
The included plugin enhances the classic compressor with modern sidechain filtering options, featuring high, low, and band-pass filters plus a dedicated de-esser. These tools provide precise frequency targeting for compression, crucial for controlling sibilance in vocals and achieving polished, professional mixes that meet today’s production standards. The Sidechain offers the ability to duck one signal with another, with a bassline and kick drum, this can provide excellent movement within the sound.
Specifications:
- Analogue opto-tube compression architecture
- Custom UK-made input and output transformers
- Hand-picked premium vacuum tubes
- Proprietary motorised potentiometers for hardware/software sync
- Automatic Opto-Cell Test System and calibration menu
- Selectable reference levels: -10 dBu, 0 dBu, +4 dBu, +20 dBu
- Integrated DAW plugin (VST3, AU, AAX) for control and automation
- Sidechain filtering with high, low, and band-pass options plus de-essing
- Advanced power supply with automatic voltage adaptation and DC tube heating
- Stereo link support with consistent compression via calibration