Opto Compressor. No plug-in or other compressor type quite compares to the warm, forgiving, fluid qualities of the classic '2A optical compressor. For decades, the renowned ‘2A style 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. The WA-2A is a high-voltage, Class-A opto-compressor, utilizing large-core CineMag USA Transformers, four premium vacuum tubes, and the legendary Kenetek opto-cell - considered by many to be the world’s finest. The WA-2A operates on Premium TungSol and Electro-Harmonix tubes: 2x 12AX7, 1x 12BH7, 1x 6AQ5 or the 6P1. Features: 100% discrete signal path. Stereo-link capability. Balanced XLR and jack inputs and outputs - 600 ohm impedance. Frequency response: +/- 1 dB, 15 - 20,000 Hz. Gain: 40 dB +/-1 dB. Input level: +16 dB maximum. Output level: +10 dB nominal, +16 dB maximum. Distortion: less than 0.1% THD at +/-10 dBm. Attack time: 10 milliseconds. Release time: 0.06 seconds for 50% release, 0.5 up to 5 seconds for complete release. Meter for gain reduction and output. Dimensions: 483 x 178 x 89 mm. Weight: 5.44 kg