Warm Audio WA-2A Tube Opto Compressor, Silver Fully discrete signal path Utilizes custom USA made CineMag input and output transformers Utilizes USA made Kenetek opto attenuator Premium Tung-Sol and Electro-Harmonix tubes Variable Pre-emphasis, allows for compression high-pass 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 max 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 worlds 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