Warm Audio WA-2A Tube Optical Compressor
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WA-2A — Tube Optical Compressor
Authentic Reproduction Of The Most Revered Compressor And Leveling Amplifier In Recording History
The WA-2A is a faithful recreation of the legendary optical tube compressor known for its smooth, musical, and forgiving compression. Combining an optical attenuation circuit with a tube output stage, it delivers natural dynamic control without sacrificing tone.
This style of compression has been used on recordings by Led Zeppelin, Nirvana, The Beatles, U2, Prince, Eric Clapton, Pharrell Williams, and many more.
Legendary Optical Compression
The WA-2A provides smooth, musical compression ideal for preserving dynamics and performance nuances.
Its simple two-knob interface makes it extremely intuitive:
- Peak Reduction — controls the amount of compression (up to 40 dB gain reduction)
- Output Gain — adjusts makeup gain (up to ~40 dB)
This streamlined design allows fast and effective results in any recording situation.
Pure Analog Signal Path
Built with a fully analog tube circuit, the WA-2A delivers:
- rich harmonic warmth
- smooth saturation
- natural dynamic response
The variable Pre-Emphasis (Tone Control) adjusts the sidechain sensitivity, allowing the compressor to react more to high frequencies and less to low-end content.
What You Need To Know
The WA-2A includes all essential features for professional use:
- Peak Reduction control
- Output Gain control
- Sidechain frequency shaping (Pre-Emphasis)
- Stereo link capability via TRS
- Gain reduction/output metering
- Balanced XLR and TRS inputs/outputs
Linking two units enables true stereo optical compression.
Technical Specifications
Type: Tube optical compressor (2A-style)
Circuit: Transformer-balanced, high-voltage
Frequency Response: 15 Hz – 20 kHz ±1 dB
Gain: 40 dB ±1 dB
Max Input Level: +16 dB
Output Level: +10 dB nominal, +16 dB max
THD: < 0.1%
Noise: -74 dB
Attack Time: ~10 ms
Release Time:
- 50%: ~0.06 sec
- full: 0.5 – 5 sec
Impedance: 600 ohms
Form Factor: 19” rack, 2U
Depth: 7”
Components & Build Quality
- CineMag USA input & output transformers
- Kenetek T4-style optical attenuator
- Tubes: (2x) 12AX7, (1x) 12BH7, (1x) 6AQ5/6P1
- Fully discrete analog signal path
CineMag transformers add harmonic richness and classic analog coloration, especially when driven.
Applications
- Lead vocals — smooth and present in the mix
- Acoustic instruments — natural dynamics
- Bass — rich sustain and body
- Orchestral recording — musical compression
- Mix bus — subtle leveling
Sound Character
The WA-2A delivers:
- smooth, musical compression
- preserved dynamics and expression
- rich tube warmth
- transparent yet characterful tone
Build Quality
Each WA-2A unit is meticulously hand-tested to ensure consistent, professional-grade performance.
Legendary Heritage
Original 2A-style compressors are a cornerstone of recording history, used on countless iconic tracks. The WA-2A brings that timeless sound into a modern, reliable format.
WA-2A — the sound of classic optical compression, reborn.
Review of Warm Audio WA-2A Tube Optical Compressor
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