Warm Audio WA-2A Tube Opto Compressor


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Warm Audio WA-2A -Vintage Style Optical Compressor

True to its inspiration; the WA-2A boasts an all tube, completely discrete signal path with through-hole component topology.  It also features custom, large-core Cinemag input and output transformers, four premium vacuum tubes, and the legendary Kenetek opto-cell, considered by many to be the world’s finest. 

No plug-in or other compressor type quite compares to the warm, forgiving, fluid qualities of this classic optical tube compressor.  For decades, the renowned ‘2A type circuit has become the go-to device for seamlessly handling vocals, bass, and a wide variety of other instruments and program material in an effortlessly smooth way.

Releasing the WA-2A would be for nothing if we couldn’t make it affordable.  Since the start of Warm Audio we have strived to give an unprecedented value to our customers, by putting high end audio within the reach of more people than ever before.  This philosophy drives everything we do, and every product we offer. 


  • ‘2A Style, Transformer balanced, high voltage, opto tube compressor

  • Fully discrete signal path

  • Utilizes custom USA made CineMag input and output transformers

  • Utilizes USA made Kenetek opto attenuator.

  • Socketed to allow for retro-fitting with other opto-cells

  • Premium Tung-Sol and Electro-Harmonix tubes. 2x 12ax7, 1x 12bh7, 1x 6aq5

  • Variable Pre-emphasis, allows for compression hipass filtering

  • Stereo-link capability

  • XLR and TRS balanced line level inputs – 600 ohms impedance

  • XLR and TRS balanced line level outputs – 600 ohms impedance

  • Frequency Response /- 1 dB, 15 Hz to 20kHz

  • Gain 40 dB ±1dB

  • Input Level 16 dB maximum

  • Output Level 10 dB nominal, 16 dB maximum

  • Distortion Less than 0.1% THD at ±10 dBm

  • Noise  = -74dB

  • Attack Time – 10 milliseconds

  • Release Time – 0.06 seconds for 50% release

  • 0.5 to 5 seconds for complete release

  • Meter shows both dB gain reduction and dB output

  • Power – 115/230 volts (switchable), 50/60 Hz

  • Dimensions – 19″ Rackmount chassis, 2U. 19″ x 7″ x 3.5″

  • Weight – 12 lbs

Additional information

Weight 12 kg