4-channel instrument and microphone preamplifier. Altran USA input and output transformers. The tone switch changes the impedance of the microphone and instrument preamps from 600 to 150 Ω. 65 dB gain. Transformer-balanced XLR and active instrument inputs. Transformer-balanced XLR and jack outputs. Output trim control for volume adjustment and saturation effects. Warm Audio offers the WA-412, featuring 4 preamps from a legendary American studio mixing console in a 1U chassis, perfect for the bedroom studio. This device also embodies the proverbial rock 'n' roll sound: large, expressive basses and open, creamy highs characterize the tracks recorded with it. In addition to standard features like phantom power, phase correction, and sensitivity reduction, the tone switch stands out. It allows the input impedance to be reduced from 600 to 150 Ω. The adjustable output level makes it easier to match with other equipment. Discrete operational amplifier circuits enable high output levels with low distortion. For this reason, each channel of the WA-412 features a 100% discrete 6-pin operational amplifier that sits on a socket, allowing for easy replacement if needed. Specially wound Altran transformers are used in the inputs and outputs, responsible for the clear and open sound of the WA-412.