Focusrite 428 MkII - 4-channel preamp for microphone, instruments (Hi-Z) and line signals. Transformer based, 4x line outputs, variable input impedance, each channel offers: phantom power, balanced inserts, phase switch and variable hi-pass filter (16-420Hz), 6-segment LEDs, optional 8-channel AD converter expansion card available (24bit/192kHz). Dimensions: 19"/2U