Essential Information About the Warm Audio WA-2A Optical Compressor
- True tube optical compressor in the "2A" style for musical, smooth, and transparent compression.
- High-voltage Class A audio path with CineMag USA transformers and Kenetek opto-electronic cell.
- Modern controls: variable pre-emphasis, high-pass filter on the sidechain, and stereo linking.
- Balanced XLR and TRS inputs/outputs, switchable VU meter for gain reduction/output level.
A Studio Classic, Faithfully Reinterpreted
Inspired by the legendary "2A" compressor that shaped decades of recordings, the WA-2A captures the warm and indulgent sonic aesthetic that made this circuit famous. Warm Audio designed it with selected components-CineMag transformers and Kenetek cell-to deliver the sought-after soft attack, harmonic density, and smoothness both tracking and mixing.
Who Is It For and What Are Its Uses?
The WA-2A is aimed at vocalists, bassists, producers, and studios seeking natural compression without artifacts. Ideal on vocals, bass, guitars, synths, and pads, it excels at leveling a track, rounding transients, and adding presence. In mixing, it provides glue on individual tracks and can be paired in stereo for dual sources.
Key Features and Workflow
The four premium tubes (2x 12AX7, 1x 12BH7, 1x 6AQ5/6P1J) provide comfortable headroom and a wide image, while the optical circuit automatically manages attack and program-dependent release for musical adaptation to the signal. Variable pre-emphasis allows fine-tuning of sidechain sensitivity to preserve low-end energy, supported by a high-pass filter to avoid bass-related over-compression. The VU meter switches between gain reduction and output level for quick and reliable adjustment, and stereo linking facilitates processing pairs or a bus.
Technical Specifications
Circuit and Components
- Single-channel tube optical compressor, high-voltage Class A
- Kenetek opto-electronic cell
- Large-core CineMag USA transformers
- Premium Tung-Sol and Electro-Harmonix tubes: 2x 12AX7, 1x 12BH7, 1x 6AQ5 (or 6P1 - interchangeable)
- Variable pre-emphasis
- High-pass filter compression options and stereo linking
Connections and Levels
- Line-level inputs: XLR and TRS jack - 600 Ohm impedance
- Balanced line-level outputs: XLR and TRS jack - 600 Ohm impedance
- Input level: +16 dB maximum
- Output level: +10 dB nominal, +16 dB maximum
Performance
- Frequency response: +/- 1 dB, 15 Hz to 20 kHz
- Gain: 40 dB (+/- 1 dB)
- Distortion: less than 0.1% THD at +/-10 dBm
- Attack time: 10 milliseconds
- Release time: 0.06 seconds for 50%, and 0.5 to 5 seconds for full release
- Display: VU meter indicating gain reduction and output level in decibels
Power Supply and Format
- Internal power supply: 115/230 Volts (switchable), 50/60 Hz
- Dimensions: 483 x 178 x 89 mm
- Weight: 5.44 kg