} Antelope Audio A4-1B Opto-Valve Compressor — Pro Audio Reserve
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Antelope Audio A4-1B Opto-Valve Compressor

$1,995.00
Availability: Translation missing: en.general.icons.icon_check_circle icon 9 in stock, ready to be shipped

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Description

Antelope Audio A4-1B Opto-Valve Compressor

The Antelope Audio A4-1B combines classic opto-tube compression with modern workflow enhancements. Designed around an all-analog signal path with premium tubes and custom transformers, the A4-1B delivers smooth, musical compression while introducing modern capabilities like plugin control, automation, and instant preset recall.

Antelope Audio A4-1B Opto Valve Compressor front panel

Classic Opto-Tube Compression

The A4-1B captures the smooth and musical response that made vintage opto-tube compressors legendary in professional studios. Its analog optical circuit reacts naturally to incoming signals, delivering controlled dynamics while maintaining transparency and musicality.

Even when driven harder, the compressor retains clarity and depth, making it ideal for vocals, bass, keyboards, and percussion. The circuit recreates the feel and behavior of classic Danish opto-tube compression while maintaining modern reliability.

 Antelope Audio A4-1B transformers and tube circuit

Premium Analog Signal Path

The A4-1B is built with carefully selected high-grade components to maintain exceptional sonic performance across the full frequency spectrum. Custom UK-made input and output transformers deliver tight low-end response, detailed highs, and rich harmonic character.

Hand-selected premium vacuum tubes shape the compressor’s tone, adding warmth and musical saturation while preserving clarity. A modern power supply design with DC tube heating ensures low noise and stable operation.

 Antelope Audio A4-1B plugin control interface

Analog Compression with Digital Control

The A4-1B introduces Antelope Audio’s analog automation system, allowing full plugin control of the hardware from your DAW. Motorized potentiometers automatically move to match software adjustments, providing instant recall and precise automation.

The included plugin supports VST3, AU, and AAX formats, enabling preset management, A/B comparisons, automation, and advanced sidechain filtering directly from your DAW. This hybrid approach allows the A4-1B to integrate seamlessly into modern analog, digital, or hybrid studio setups.

Key Features

  • Opto-tube compression circuit
  • All-analog signal path
  • Custom UK-made input and output transformers
  • Premium vacuum tube amplification
  • Motorized potentiometers for instant recall
  • Full DAW automation and plugin control
  • Integrated calibration system
  • Sidechain filtering and de-essing via plugin
  • VST3 / AU / AAX plugin compatibility

What’s Included

  • Antelope Audio A4-1B Opto-Valve Compressor
  • A4-1B Plugin for automation and preset recall
Shipping

Shipping & Returns

  • We deliver all US orders in 3–5 business days
  • Free cancellations
  • Returns accepted within 30 days (unused items)

Order Confirmation

Once your order is placed, you will receive an order confirmation email. This confirms that we have received your order and have pre-authorized your credit card for the purchase. After confirming availability with our suppliers, we will proceed accordingly:

  • If your item is available and ready to ship within 1–2 business days, we will process the charge and arrange for shipment.

  • If your item is on backorder or unavailable, the pre-authorization will be voided and you will be notified by email.

  • Please note: While most items ship out within 1–2 business days, total delivery time is typically 3–5 business days, depending on your location and carrier handling.

Order Shipment

If your item is in stock and your payment has been processed, your order will typically ship within 1–2 business days. Total delivery time is approximately 3–5 business days from the date of order. Once shipped, you will receive tracking information at the email address provided during checkout within 24 hours of dispatch.

If you have not received tracking information within 3–5 business days of placing your order, please contact us at support@proaudioreserve.com.

The Distributor-Direct Advantage

To ensure you receive the most recent hardware revisions and 100% factory-sealed units, Pro Audio Reserve utilizes a Distributor-Direct fulfillment model. Unlike big-box retailers that may ship "floor models" or gear that has been sitting in general-purpose warehouses, your equipment is pulled directly from the primary manufacturer hub, serialized, and dispatched. This process ensures the highest level of quality control for professional-grade recording equipment.

Shipping Policy

We currently offer free shipping within the United States only. If the checkout process on our website allows you to enter a shipping address and complete your order, your location is eligible to receive delivery.

Changing Shipping Address

If you need to change your shipping address after your order has been processed or shipped, we will do our best to accommodate the request. Please note that address changes may result in delivery delays. Any additional costs incurred due to address changes, including carrier fees or rerouting charges will be the responsibility of the customer. No exceptions.

Shipping Times

All shipping times provided are estimates and should not be considered guarantees. Most orders ship out within 1–2 business days from the time payment is processed. However, total delivery time is typically 3–5 business days, depending on your location, carrier performance, and supplier fulfillment timelines.

We work closely with our vendors to ensure timely deliveries, but please note that supply chain disruptions, high-demand periods, or weather events may occasionally cause delays beyond our control.

  • To avoid misunderstandings: The “shipping time” refers to the total time from order placement to final delivery, not just when the item leaves the warehouse.

  • Cancellations: If you choose to cancel your order because it has not arrived within the estimated delivery window, you may be responsible for applicable shipping charges, restocking fees, warehouse handling costs, and other related fees.

  • Chargebacks: Customers who initiate chargebacks due to shipping delays without contacting us first may be held legally responsible for losses. We strongly encourage open communication so we can resolve any delivery concerns directly and efficiently via our Atlanta-based support team.

Delivery Options

  • Threshold Shipping: Your item will be delivered to your front door, porch, garage, or a covered entryway.

 

Why Buy From Us

We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at ProAudioReserve.

  • Free Shipping USA wide. 
  • 30 Day Easy Returns. Not happy with your product, we'll take it back noquestions asked.
  • Great Service. We pride ourselves on the best service, anywhere.

Reviews

Customer Reviews

Be the first to write a review
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Description

Antelope Audio A4-1B Opto-Valve Compressor

The Antelope Audio A4-1B combines classic opto-tube compression with modern workflow enhancements. Designed around an all-analog signal path with premium tubes and custom transformers, the A4-1B delivers smooth, musical compression while introducing modern capabilities like plugin control, automation, and instant preset recall.

Antelope Audio A4-1B Opto Valve Compressor front panel

Classic Opto-Tube Compression

The A4-1B captures the smooth and musical response that made vintage opto-tube compressors legendary in professional studios. Its analog optical circuit reacts naturally to incoming signals, delivering controlled dynamics while maintaining transparency and musicality.

Even when driven harder, the compressor retains clarity and depth, making it ideal for vocals, bass, keyboards, and percussion. The circuit recreates the feel and behavior of classic Danish opto-tube compression while maintaining modern reliability.

 Antelope Audio A4-1B transformers and tube circuit

Premium Analog Signal Path

The A4-1B is built with carefully selected high-grade components to maintain exceptional sonic performance across the full frequency spectrum. Custom UK-made input and output transformers deliver tight low-end response, detailed highs, and rich harmonic character.

Hand-selected premium vacuum tubes shape the compressor’s tone, adding warmth and musical saturation while preserving clarity. A modern power supply design with DC tube heating ensures low noise and stable operation.

 Antelope Audio A4-1B plugin control interface

Analog Compression with Digital Control

The A4-1B introduces Antelope Audio’s analog automation system, allowing full plugin control of the hardware from your DAW. Motorized potentiometers automatically move to match software adjustments, providing instant recall and precise automation.

The included plugin supports VST3, AU, and AAX formats, enabling preset management, A/B comparisons, automation, and advanced sidechain filtering directly from your DAW. This hybrid approach allows the A4-1B to integrate seamlessly into modern analog, digital, or hybrid studio setups.

Key Features

  • Opto-tube compression circuit
  • All-analog signal path
  • Custom UK-made input and output transformers
  • Premium vacuum tube amplification
  • Motorized potentiometers for instant recall
  • Full DAW automation and plugin control
  • Integrated calibration system
  • Sidechain filtering and de-essing via plugin
  • VST3 / AU / AAX plugin compatibility

What’s Included

  • Antelope Audio A4-1B Opto-Valve Compressor
  • A4-1B Plugin for automation and preset recall
Shipping

Shipping & Returns

  • We deliver all US orders in 3–5 business days
  • Free cancellations
  • Returns accepted within 30 days (unused items)

Order Confirmation

Once your order is placed, you will receive an order confirmation email. This confirms that we have received your order and have pre-authorized your credit card for the purchase. After confirming availability with our suppliers, we will proceed accordingly:

  • If your item is available and ready to ship within 1–2 business days, we will process the charge and arrange for shipment.

  • If your item is on backorder or unavailable, the pre-authorization will be voided and you will be notified by email.

  • Please note: While most items ship out within 1–2 business days, total delivery time is typically 3–5 business days, depending on your location and carrier handling.

Order Shipment

If your item is in stock and your payment has been processed, your order will typically ship within 1–2 business days. Total delivery time is approximately 3–5 business days from the date of order. Once shipped, you will receive tracking information at the email address provided during checkout within 24 hours of dispatch.

If you have not received tracking information within 3–5 business days of placing your order, please contact us at support@proaudioreserve.com.

The Distributor-Direct Advantage

To ensure you receive the most recent hardware revisions and 100% factory-sealed units, Pro Audio Reserve utilizes a Distributor-Direct fulfillment model. Unlike big-box retailers that may ship "floor models" or gear that has been sitting in general-purpose warehouses, your equipment is pulled directly from the primary manufacturer hub, serialized, and dispatched. This process ensures the highest level of quality control for professional-grade recording equipment.

Shipping Policy

We currently offer free shipping within the United States only. If the checkout process on our website allows you to enter a shipping address and complete your order, your location is eligible to receive delivery.

Changing Shipping Address

If you need to change your shipping address after your order has been processed or shipped, we will do our best to accommodate the request. Please note that address changes may result in delivery delays. Any additional costs incurred due to address changes, including carrier fees or rerouting charges will be the responsibility of the customer. No exceptions.

Shipping Times

All shipping times provided are estimates and should not be considered guarantees. Most orders ship out within 1–2 business days from the time payment is processed. However, total delivery time is typically 3–5 business days, depending on your location, carrier performance, and supplier fulfillment timelines.

We work closely with our vendors to ensure timely deliveries, but please note that supply chain disruptions, high-demand periods, or weather events may occasionally cause delays beyond our control.

  • To avoid misunderstandings: The “shipping time” refers to the total time from order placement to final delivery, not just when the item leaves the warehouse.

  • Cancellations: If you choose to cancel your order because it has not arrived within the estimated delivery window, you may be responsible for applicable shipping charges, restocking fees, warehouse handling costs, and other related fees.

  • Chargebacks: Customers who initiate chargebacks due to shipping delays without contacting us first may be held legally responsible for losses. We strongly encourage open communication so we can resolve any delivery concerns directly and efficiently via our Atlanta-based support team.

Delivery Options

  • Threshold Shipping: Your item will be delivered to your front door, porch, garage, or a covered entryway.

 

Why Buy From Us

We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at ProAudioReserve.

  • Free Shipping USA wide. 
  • 30 Day Easy Returns. Not happy with your product, we'll take it back noquestions asked.
  • Great Service. We pride ourselves on the best service, anywhere.

Reviews

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)