Warm Audio WA-1B All-Tube Optical Compressor

Dial in smooth, musical tube-opto compression with Warm Audio's homage to the coveted Lydkraft blue compressor -- an industry standard on vocals and more!

The Warm Audio WA-1B is an accurate recreation of a world-class Scandinavian compressor combining smooth tube-optical warmth with precision controls. Like the original favored by producers and engineers from Chris Lord-Alge to Rick Rubin, the WA-1B delivers that revered "forgiving" musical compression of tube-optical circuitry with speed and control more closely associated with modern dynamics processing. Hand-wired to authentically recreate the original true-to-spec circuit, the WA-1B combines custom large-core transformers from Lundahl Sweden, select tubes from JJ and Tung-Sol, and a premium high-precision optical element for ultra-fast and accurate operation without sacrificing authentic analog warmth.

True-To-Original Controls

To deliver extended dynamics processing, the WA-1B delivers all of the classic, extended controls of the original including infinite 2:1 - 10:1 ratios, variable threshold, fixed/manual/combined attack & release, multiple metering options, dual sidechain bus connections, and true-bypass operation.

Threshold: The WA-1B supports a variable threshold giving maximum control to the user regarding how much compression is applied to any signal at various input levels.

Ratio: The WA-1B ratio is variable and has infinite controls between 2:1 and 10:1. From soft musical dynamic control all the way to hard-smashing compression!

Attack & Release: The Attack/Release controls on the WA-1B are unique in that the attack/release operations can be switched from a read more fixed setting, manual (variable) setting, or a combined setting. In the "fixed" mode, the WA-1B delivers the natural attack & release time of the optical element. The combined setting in particular creates the opportunity for a more nuanced release-time curve. This dueling time-constant circuit operation is a special feature of the WA-1B and its original inspiration.

Meter Switch:The WA-1B meter switch has three settings: input, compression, and output levels. Set to "input", the VU meter reads the level at the input connector. Set to "compression", the VU meter is reading gain reduction. The steady state is "0", and the amount of compression is shown as the needle moving right-to-left away from 0dB. Set to "output", the VU meter reads the level at the output connector.

On/Bypass:The on/bypass switch on the WA-1B activates or bypasses the compressor. This is a hard bypass, meaning no signal passes through the circuitry in bypass mode.

Premium Components

The WA-1B is a 270v circuit with handwired through-hole circuitry and a 100% discrete analog signal path. The custom large-core transformers from Lundahl Sweden bring the full Scandinavian-style analog tone of the WA-1B circuit to life. Paired with select tubes from JJ and Tung-Sol, the high-precision optical element applies sweet analog warmth to audio signals with unrivaled accuracy.

Hand-Tested In Austin, TX

Like all Warm Audio gear, the WA-1B is meticulously hand-tested and inspected by trained technicians with a passion for making music in Austin, TX, USA.


- Accurate recreation of a world-class Scandinavian compressor combining smooth tube-optical warmth with precision controls
- True-to-spec 270 volt, 100% discrete analog signal path - handwired with through-hole components
- Transformer-balanced fully floating input and output - Custom-core large transformers from Scandinavian Manufacturer, Lundahl in Sweden
- Two bus connectors to connect multiple sidechains
- Meter (VU) input, output, or compression amount
- Linear, low-noise power supply with toroidal power transformer
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- Tubes: 12ax7 Tung-Sol & JJ 12au7
- Frequency response: @ -3 dB: 5 Hz to 25 kHz
- Self-Noise: < -75 dBU @ 30 dB gain
- CMRR: > 60 dB @ 10 kHz
- Ratio: from 2:1 to 10:1
- Variable Threshold: Off to -40 dBU
- Continuously variable attack and release times: fast-slow
- Output gain: Off to +30 dBU
- Input impedance: 600O
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 12.09 lbs
Shipping Dimensions: 23 x 13 x 6 in
Manufacturer Part Number (MPN): WA-1B
Warehouse Resealed
Shipping Weight: 10.3 lbs
Shipping Dimensions: 23 x 10 x 6 in
Manufacturer Part Number (MPN): WA-1B

For support or warranty questions, please contact the manufacturer:
Web: https://warmaudio.com/contact-support/


  • 18 x  
  • 12 x  
    $99.92 with zZounds
  • 8 x  
    $149.88 with zZounds
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