Antelope Audio A4-1B Analog Automated Opto Valve Compressor - Ultimate
UPC/EAN #850041548135
MPN #A4-1B Analog Automated Opto Valve Compressor - Ult
Ultimate analog control, motorized pots, full DAW automation, preset recall, plugin integration, sidechain de-essing, rich tube tone, UK transformers
The A4-1B Ultimate is the flagship version of Antelope Audio's revolutionary opto-tube compressor, delivering the full analog experience fused with the complete power of digital automation, recall, and control. Designed for modern producers who demand the tactile quality of premium analog gear and the precision of plugin-based workflows, this version unlocks the A4-1B's entire potential.
Built around a meticulously engineered all-tube circuit with custom transformers and hand-picked premium tubes, the Ultimate version reproduces the silky compression and harmonic depth of classic vintage units " but enhances them with next-level functionality. With proprietary motorized potentiometers, plugin-based control, and DAW automation, every setting is instantly recallable and adjustable in real-time, both physically and virtually.
Included only in the Ultimate version are powerful extras such as sidechain filtering with de-essing, dynamic preset management, Opto-cell auto calibration, and high-precision VU metering control. Its plugin (VST3/AU/AAX) offers full automation of every parameter - Attack, Release, Gain, Threshold, Ratio - all of which physically move on the hardware via motorized controls, giving you unmatched feedback and responsiveness.
Features
Signature Analog Compression Sound: Delivers the smooth, musical tone of classic opto-tube compressors with 100% analog signal path.Motorized Hardware with DAW Control: Includes full integration with DAW plugin (VST3, AU, AAX) for remote control and real-time automation.Unlimited Preset Recall & A/B Comparison: Save, load, and switch between presets instantly - perfect for fast workflows and consistent results.Plugin Included - Full License: Comes with the A4-1B plugin for total software/hardware integration and modern workflow enhancements.Responsive Automation: Automate threshold, attack, release, ratio, and gain from your DAW - reflected instantly on the hardware.Advanced Sidechain Features: Built-in plugin filtering with high-pass, low-pass, band-pass, and dedicated de-essing mode.Auto Calibration System: Maintains long-term accuracy and stereo matching with built-in opto-cell testing and alignment tools.Selectable Timing Modes: Use fixed, manual, or hybrid attack and release timing for tailored dynamic shaping.Multiple Metering Reference Levels: Choose between -10 dBu, 0 dBu, +4 dBu, and +20 dBu reference points for precise VU monitoring.Modern Power Supply: Efficient, quiet PSU with automatic voltage adaptation and DC tube heating for reduced noise.Custom Analog Hardware: Built with UK-made transformers, premium tubes, and proprietary motorized potentiometers for lasting performance.
Specifications
General Specifiations
100 percent analog audio circuitryAll tube-based push-pull amplifier designPre-sorted opto-cell for ultra-precise compressionHand-selected premium vacuum tubesCustom UK-made input and output transformersHigh-grade components for maximum sonic fidelityFrequency 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
Compressor Parameters
Ratio: continuously variable from 2 to 10Threshold: adjustable from off to -40 dBuAttack: 0.5 ms to 300 msRelease: 50 ms to 10 sGain: adjustable from off to +30 dBModes: fixed, manual, hybrid compression
Metering & Calibration
VU meter monitoring: input, output, gain reductionSelectable reference levels: -10 dBu, 0 dBu, +4 dBu, +20 dBuBuilt-in opto-cell calibration and test systemOptimized for consistent stereo link operation
Advanced Digital Integration
Fully motorized potentiometers for physical and remote automationDAW plugin control via VST3, AU, AAX formatsReal-time bidirectional sync between plugin and hardwareFull automation of attack, release, gain, threshold, and ratioPreset recall system with fast A/B comparison supportUnlimited preset saving and recall within DAW sessionsExtended sidechain filtering: high-pass, low-pass, band-passDedicated de-essing via narrow band-pass side-chain filter
Power & Environment
Input voltage: 95 V to 245 V, 50/60 HzModern PSU with automatic voltage adaptation and DC tube heatingOperating temperature: 0 to 50 degrees C
Physical Dimensions
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 Ultimate Version
A4-1B analog compressorPower cableUSB-C to USB-C cableGet Started leafletA4-1B Plugin Perpetual License leaflet (Ultimate edition)
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