Antelope Audio A4-1B Opto Valve Compressor
UPC/EAN #850041548098
MPN #A4-1B Opto Valve Compressor
Fully analog opto-valve compressor with precise tube-driven compression, DAW integration, motorized controls, and advanced filtering for modern professional audio workflows.
The A4-1B Analog Automated Opto-Valve Compressor is a high-performance audio device that masterfully blends classic analog warmth with cutting-edge digital precision. Designed for audio professionals seeking the rich, authentic sound of vintage Scandinavian tube compression, the A4-1B offers a fully analog signal path constructed with top-tier components. Custom transformers and premium tubes provide high-fidelity audio with tight low-end response, while its opto-cell detection system ensures precision in compression characteristics. The unit is equipped with advanced filters, including high-pass, band-pass, and de-esser modes, making it versatile for vocal, instrument, and sidechain applications.
Modern technology enhances its usability with DAW integration via the optional A4 software suite, enabling remote control, automation, and preset recall through VST3, AAX, or AU plugins. Proprietary motorized potentiometers and advanced digital control streamline adjustments for efficiency and consistency. Whether you're in a studio or live setting, the A4-1B delivers a seamless mix of vintage tone and contemporary functionality, ensuring it's a perfect fit for professional workflows.
Features
Captures the classic Scandinavian compression tone with a fully analog circuit.Premium tubes and custom transformers deliver high-fidelity, rich, and warm audio.Combines analog design with digital precision for seamless performance.Digital controls enable faster adjustments and ensure reliable, noise-free operation.Variable attack and release times for tailored compression.Sidechain filtering includes low-pass, high-pass, and band-pass options.De-esser mode ensures clean and precise vocal and instrument handling.DAW integration allows remote control, automation, and preset recall.Motorized knobs apply settings instantly to hardware.Includes a VU-meter for monitoring input, output, and compression levels.Automated calibration ensures consistent performance over time.Remote operation through plugins or a standalone app.Includes a free one-year membership with access to additional plugins and updates.
Specifications
General Specifications
100% analog audio circuitCustom-designed UK transformersHigh-quality tubes for sonic performancePre-sorted opto-cell for compression precisionAll tube-based push-pull amplifierContinuously variable attack and release times
Audio Features
Ratio: 2:1 to 10:1Threshold: off to -40 dBuAttack: 0.5 ms to 300 msRelease: 50 ms to 10 sGain: off to +30 dBMaximum output level: +24 dBuMaximum input level: +24 dBuNoise level: < -80 dBuInput impedance: 10 kOhms differentialOutput impedance: <60 OhmFrequency response: 20 Hz to 20 kHz ±1 dB
Automation and Digital Features
Remote control via VST3, AAX, AU plugin, or standalone appProprietary motorized knobs for instant hardware settingsAutomation for attack, release, gain, threshold, and ratio via DAW pluginComprehensive preset system for session recall and A/B testingExtended sidechain filtering: low pass, high pass, band pass filtersDe-esser mode with narrow band pass filter
Power and Design
Modern power supply with automatic voltage adaptation (95 V-245 V, 50-60 Hz)DC heating for tubes to reduce noise and enhance warmthConsistent stereo-link performance via calibration systemOperating temperature: 0-50C (32-122F)
Metering and Calibration
VU meter for input, compression, and output monitoringMultiple reference levels for precise metering
Physical Dimensions and Weight
Device dimensions: 88 mm (H) x 483 mm (W) x 252 mm (D) / 3.47 in (H) x 18.98 in (W) x 9.92 in (D)Device weight: 4.4 kg (9.70 lbs)Box dimensions: 140 mm (H) x 640 mm (W) x 350 mm (D) / 5.51 in (H) x 25.20 in (W) x 13.78 in (D)Box weight: 6.5 kg (14.33 lbs)
In-the-Box Contents
A4-1B analog compressorPower cableUSB-C to USB-C cableGet Started leaflet
Additional Features
Includes one year of Antelope Membership with Synergy Core Native plugins and updatesOptional A4 software suite available via membership plan
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