Microphone and instrument preamp. The WA-412 provides 4 channels of classic American console preamps in a sleek 1RU design. This style of preamp is often referred to as ''the sound of Rock n' Roll'' for its BIG punchy low end and smooth open top end. Featuring fully discrete socketed 6-pin op-amps and custom wound Altran USA input and output transformers, the WA-412 leaves nothing to be desired. Features: 100% discrete, transformer-balanced circuit. X520 operational amplifiers in each channel (exchangeable if required, as plugged on base). 65 dB gain. Transmitter-balanced XLR and active instrument inputs. Transformer-balanced XLR and jack outputs. TONE switch changes the impedance of the microphone and instrument preamp from 600 to 150 ohms. -20 dB pad (affects microphone and instrument preamps). +48 V phantom power. LED metering. Output-Trim control for precise volume control and saturation effects. Format: 19 ''/ 1U