Antelope Audio A4-1B Analog Automated Opto Valve Compressor - Complete
UPC/EAN #850041548128
MPN #A4-1B Analog Automated Opto Valve Compressor - Com
Full analog opto-tube path, DAW plugin control, motorized pots, preset recall, sidechain filters, UK transformers, auto calibration, rich harmonic tone
The Antelope Audio A4-1B is a groundbreaking analog hardware compressor that seamlessly merges vintage opto-tube warmth with cutting-edge digital control, giving audio professionals the best of both worlds in a complete, fully integrated system. Engineered to preserve the smooth, musical compression characteristics of legendary optical-tube units, the A4-1B elevates analog gear with modern-day workflow features that redefine studio flexibility.
At its core, the A4-1B features a hand-built, all-analog signal path, including custom UK-made transformers, hand-selected vacuum tubes, and a meticulously accurate circuit topology based on the iconic Danish opto design. This results in an unmistakably rich, warm tone that adds depth and character to vocals, bass, keys, and drums - with transparency and musicality even at high compression ratios.
Where the A4-1B truly breaks new ground is in its full digital integration. Through its dedicated VST3, AU, and AAX plugin, users gain precise remote control, DAW automation, instant preset recall, and even real-time motorized potentiometer movements that mirror plugin adjustments physically on the hardware. Features like sidechain filtering, de-essing, and A/B comparison are seamlessly built into the plugin, giving producers surgical precision in any modern production scenario.
Features
Authentic Opto-Tube Compression: 100% analog signal path with hand-picked tubes and custom UK-made transformers for warm, musical dynamics.Complete Plugin Integration: Includes perpetual license for the A4-1B plugin (VST3, AU, AAX) with full control of hardware parameters inside your DAW.Motorized Controls with Automation: Proprietary motorized potentiometers instantly respond to DAW automation and plugin adjustments.Instant Preset Recall & A/B Switching: Save unlimited presets in your DAW and switch between settings for fast comparisons and consistent recall.Advanced Sidechain Filtering & De-Essing: Built-in plugin filters (HP, LP, BP) for precise frequency control; includes vocal de-essing mode.Automatic Calibration System: Built-in self-calibration maintains compression accuracy and stereo consistency over time.Selectable Compression Modes: Choose from fixed, manual, or hybrid timing for flexible response to vocals, bass, keys, and more.Multiple Reference Levels: Selectable metering references (-10 dBu, 0 dBu, +4 dBu, +20 dBu) and VU monitoring for optimal alignment.High-Performance Specs: +24 dBu input/output headroom, < -80 dBu noise floor, and wide 20 Hz " 20 kHz +/- 1 dB response.Modern Power Supply: Auto-switching PSU with DC tube heating for lower hum, smoother startup, and global voltage compatibility.
Specifications
General Specification
100 percent analog signal pathAll tube-based push-pull amplifier circuitPre-sorted opto-cell for precision compressionCustom UK-made input and output transformersPremium hand-selected vacuum tubesHigh-quality components throughoutFrequency response: 20 Hz to 20 kHz ±1 dBInput impedance: 10 kOhm differentialOutput impedance: less than 60 OhmMaximum input level: +24 dBuMaximum output level: +24 dBuNoise level: less than -80 dBu
Compression Parameters
Continuously variable ratio: 2 to 10Threshold range: off to -40 dBuAttack time: 0.5 ms to 300 msRelease time: 50 ms to 10 sGain range: off to +30 dBModes: fixed, manual, hybrid
Monitoring & Calibration
VU-meter modes: input, output, gain reductionReference level selection: -10 dBu, 0 dBu, +4 dBu, +20 dBuBuilt-in opto-cell test and calibration systemCalibration support for stereo-linked operation
DAW Control & Automation
Motorized potentiometers for remote controlFull plugin control via VST3, AU, AAXReal-time synchronization with hardware unitPlugin automation of attack, release, gain, threshold, ratioPreset management system with A/B comparisonPlugin recall inside DAW projectsExtended filtering: high-pass, low-pass, band-passDe-essing with narrow band-pass side-chain filter
Power & Environmental
Power: 95 V to 245 V, 50/60 HzModern PSU with automatic voltage adaptationOperating temperature: 0 to 50 C
Physical Specifications
Unit dimensions (H x W x D): 88 x 483 x 252 mmUnit weight: 4.4 kgBox dimensions (H x W x D): 140 x 640 x 350 mmShipping weight: 6.5 kg
Included in Complete Version
A4-1B analog compressorPower cableUSB-C to USB-C cableGet Started leafletA4-1B Plugin Perpetual License leaflet (Complete edition)
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