Warm Audio TB12, 500 Series Mic Preamp with CineMag Transformers, one Channel Mic-Pre, 71dB Gain, Discrete Opamp selection provides both the classic 1731 (vintage) and 918 (cleaner) style opamps, 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, 80hz hipass filter, Polarity Reverse, Capacitor selection between Tantalum and Electrolytic for different characters, Front Panel Connectors: XLR Mic-In, Hi-Z Instrument Input 1/4" TRS, Line-Input 1/4" TRS balanced, 500 Series Module