Antelope A4-1B Opto Valve Compressor (Complete)

The Antelope A4-1B Opto Valve Compressor combines the warmth of classic tube compression with the precision and flexibility of modern technology. This complete version includes a 2-year access to Synergy Core Native and a perpetual access to the A4-1B Plug-in.

Faithfully recreating the iconic Scandinavian sound, the A4-1B boasts a fully analog circuit for the audio signal, built with the highest quality components to ensure precise and transparent compression. Its advanced features, including DAW integration for remote control and automation, and filtering for targeted compression, provide a seamless experience for audio professionals seeking both authenticity and innovation.

• All-analog design preserving the true sound of classic opto-valve compression
• Custom transformers & hi-end tubes for tight low-end and high-fidelity audio
• Remote control, with automation and preset recall
• Proprietary motorized potentiometers ensuring instant remote response
• User-configurable high-pass, band-pass and de-essing filters

As Authentic as It Gets.
The A4-1B captures the essence of legendary compression. A painstakingly accurate signal path, premium tubes, and custom transformers combine for unparalleled authenticity and low-end richness. The precise opto-cell detection system guarantees precise compression characteristics, matching the authentic behavior of the original. Crafted with premium analog components, the A4-1B is not just a compressor—it’s a testament to the timeless quality of true analog engineering.

Classic Sound, Modern Engineering.
The A4-1B combines analog warmth with modern engineering for unparalleled performance. Its efficient power supply ensures stability and reliability with automatic voltage adaptation, while DC heating for the tubes minimizes noise and enhances tonal warmth. Digital control technology streamlines compression adjustments, offering faster and more precise operation. These innovations not only improve the device's efficiency but also enhance the overall user experience, making the A4-1B a perfect blend of classic sound and modern precision for professional audio workflows.

Digital Control & Recall
The Antelope A4-1B Automation & Control Plug-In allows users to adjust parameters like Attack, Release, Gain, Threshold, and Ratio straight from their DAW. Changes made in the plug-in are mirrored to the hardware instantly via motorized potentiometers, while hardware adjustments are fed back into the software—creating a tightly integrated analog/digital workflow!

Antelope A4-1B Opto Valve Compressor Features

• Authentic Analog Sound
  • 100% purely analog circuit for the audio signal
  • High-quality components ensuring superior sonic performance
  • Custom-designed UK transformers and high-quality tubes
  • Pre-sorted opto-cell for optimal compression precision
  • All tube-based push-pull amplifier
  • Continuously variable attack and release time
• Automated calibration systems
  • Ensured compression precision over time
  • Modern power supply for tube longevity and reduced humming
  • Consistent stereo-link performance via calibration system
  • Multiple reference levels for metering
  • VU-meter for monitoring input, compression and output
• A4 – Antelope Audio Analog Automation (optional)
  • Optional Antelope A4-1B Automation & Control Plug-In for remote control via VST3, AAX or AU plugin, or standalone control app
  • Settings instantly applied on hardware via proprietary motorized knobs
  • Comprehensive file preset system
  • Automation for attack, release, gain, threshold and ratio via DAW plugin
  • Extended filtering section with low pass, high pass and band pass filtering for side chain signal
  • De-esser mode utilizing narrow band pass filter

Antelope A4-1B Opto Valve Compressor Specifications

• Compressor:
  • Ratio: 2:1 to 10:1
  • Threshold: off to -40 dBu
  • Attack: 0.5 ms to 300 ms
  • Release: 50 ms to 10 s
  • Gain: off to +30 dB
• Maximum output level: +24 dBu
• Maximum input level: +24 dBu
• Noise level: < -80 dBu
• Input impedance: 10 kOhms differential
• Output impedance: <60 Ohm
• Frequency response: 20 Hz to 20 kHz ±1 dB
• Power: 95 V/245 V, 50-60 Hz
• Dimensions:
  • Height: 88 mm (3.47 in)
  • Width: 483 mm (18.98 in)
  • Depth: 252 mm (9.92 in)
  • Weight: 4.4 kg (9.70 lbs)

Antelope A4-1B Opto Valve Compressor Includes

• Antelope A4-1B Opto Valve Compressor
• Power Cable
• USB-C to USB-C Cable
• Get Started Leaflet
• 2-year Access to Synergy Core Native
• Perpetual Access to A4-1B Plugin
• Manufacturer Warranty