Warm Audio TB12 Tone Beast, Mic Preamp with CineMag Transformers, one Channel Mic-Pre, 71dB Gain, Tone Button to switches the input impedance from 600 ohms to 150 ohms for Mic- and Hi-Z Input, switchable Phantom Power 48V, -20dB Pad, HP-Filter, Polarity Reverse, Connections: XLR Mic-Input balanced Front and Rear, Line- and Hi-Z Instrument Input 1/4" TR, balanced Line-Out XLR and 1/4" TRS, Insert 1/4", external Power Supply, 19" 1U