Great River MP-500NV, Channel Strip, Balanced XLR inputs and outputs, High-impedance 6,3 mm jack guitar input on the front (automatically disconnects the XLR microphone input), Adjustable pre-amplification in 5 dB steps up to 60 dB, Output: -25 dB to +10 dB, High-Current 70ma Class A BIAS at the output, Input / output display, Adjustable input impedance: 1200 and 300 ohms, Output: 600 Ohm, Construction: API Series 500 format, Requires two 500 slots