Warm Audio WA-2A Mono Optical Compressor

Manufacturer's description

The Warm Audio WA-2A is a classic optical compressor designed for musicians, producers, and engineers who want smooth, vintage-style dynamics control. Its tube-driven circuit and premium CineMag transformers add rich harmonic warmth, making it ideal for vocals, bass, acoustic instruments, and more. The simple two-knob operation provides effortless control over peak reduction and output gain, while the high-pass sidechain filter offers added flexibility. Basing its design on a classic vintage compressor the WA-2A retains the tone and character of the original with a range of modern updates.

For stereo applications, the dedicated link input makes pairing two units seamless. Built with premium components and hand-tested for quality, the WA-2A delivers legendary compression with an authentic analog feel. The WA-2A's optical compression circuit is known for its gentle, natural response. Unlike aggressive compressors that can squash tone, the WA-2A applies compression gradually, making it perfect for maintaining the musicality of a performance. Perfect for smoothing out vocal takes, tightening up bass lines, or adding subtle control to acoustic instruments; this 2A-style compressor ensures dynamic consistency without sacrificing character.

Legendary optical compression with tube warmth

The WA-2A is built to replicate the most sought-after optical compression circuit of all time. Favoured by engineers and producers for its smooth, musical response, this style of compression preserves dynamics while subtly enhancing tone. Instead of clamping down aggressively on transients, the optical circuit reacts naturally to incoming signals, ensuring a transparent and organic sound.

One of the key elements of this compressor is its tube-driven design. Using high-quality vacuum tubes, the WA-2A injects warmth and harmonic richness into the audio signal, creating a fuller and more polished sound. This makes it particularly effective on lead vocals, where it helps achieve a professional, radio-ready tone. Additionally, bass guitars benefit from the compressor’s ability to tighten the low end while keeping the performance dynamic and expressive.

Premium CineMag transformers for rich analog tone

Inside the WA-2A, USA-made CineMag transformers play a crucial role in shaping its sound. These transformers introduce harmonic overtones and subtle saturation, adding depth and warmth as the output gain is increased. The result is a smooth, vintage-style compression that enhances the overall character of a recording.

Transformers are an essential part of classic analog gear, and the WA-2A stays true to this tradition. The carefully selected CineMag components allow the unit to produce a rich, full-bodied tone that blends seamlessly into a mix. Whether used for tracking or mixing, this compressor helps achieve a natural and cohesive sound without excessive EQ or additional processing.

High-pass sidechain filter for precise compression

The WA-2A includes a high-pass sidechain filter, giving users more control over how compression is applied. With the filter set to the flat position, the compressor reacts to the entire frequency spectrum. As the control is adjusted, it reduces sensitivity to lower frequencies, allowing high-frequency transients to trigger compression more effectively.

This is particularly useful when working with bass-heavy sources. Low-frequency energy can sometimes cause a compressor to overreact, leading to unwanted pumping effects. By filtering out some of the lower frequencies in the sidechain, the WA-2A ensures smoother and more consistent compression, making it ideal for vocals, acoustic instruments, and mix bus processing.

Stereo linking for dual-unit operation

For those working with stereo sources, the WA-2A offers a dedicated stereo link input. Connecting two units together allows them to share a common threshold response, ensuring even compression across both channels. This is particularly useful for bus compression on drum overheads, stereo instruments, or mix bus processing.

When using the stereo link function, it is important to manually match the front-panel controls, especially the output gain. This ensures a consistent balance between the two units, providing smooth and transparent stereo compression. The ability to link two compressors makes the WA-2A a versatile tool for both individual tracks and full mixes.

Hand-tested for superior build quality

Each WA-2A is meticulously hand-tested at Warm Audio’s facility in Austin, Texas. Every unit is inspected by skilled technicians to ensure it meets high standards of performance and reliability. By using high-quality components and precise assembly techniques, Warm Audio ensures that every WA-2A delivers consistent results in both studio and live environments.

This attention to detail makes the WA-2A a reliable choice for engineers and producers who need a compressor they can trust. Whether used for tracking vocals, mixing a full band, or adding the final polish to a master, the WA-2A provides the smooth, musical compression that has made optical compressors a staple in professional studios for decades.

Features

• Design based on a classic LA-2A style leveling amplifier
• Conveniently housed in a 2U chassis for studio use
• Fully discrete signal path
• Premium-grade Cinemag USA Transformers
• Kenetek opto attenuator
• Wide frequency range (15 Hz to 20kHz)
• Stereo-link capability
• Variable Pre-emphasis, allows for compression hipass filtering
• Socketed to allow for retro-fitting with other opto-cells
• XLR and TRS balanced line level inputs and outputs
• Five-year manufacturer warranty

Specifications

• Line Level, Transformer Balanced Input: 600 ohms impedance pin 2/tip=positive, pin 3/ring=negative, pin 1/sleeve=ground
• Line Level, Transformer Balanced Output: 600 ohms impedance pin 2/tip=positive, pin 3/ring=negative, pin 1/sleeve=ground
• Frequency Response: +/- 1 DB, 15 HZ TO 20KHZ
• Maximum Gain: +40 dB ±1dB
• Maximum Peak Reduction: -40 dB ±3dB
• 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
• Tube Compliment: 2x 12AX7, 1x 12BH7, 1x 6P1 (compatible with 6aQ5, 6005, and 6N1N)
• Optical Attenuator: Kenetek T4B module (socketed) (compatible with T4A, T4B, and T4C modules per standard wiring configuration to standard octal header
• Power: 115/230 volts (switchable), 50/60 Hz, standard IEC 3 conductor cord
• Fuse Compliment: 1x 250v, 1amp fast-blow type fuse