Black Lion Audio B173 Quad Mic Preamp, 4-Channel Microphone Preamplifier, Classic 1073 preamp design with 70 dB gain, Discrete Class A circuit, Input and output transformers from Cinemag, Channels 1 and 2 with additional DI input, Switchable 48 V phantom power per channel, Max. Input level Mic In: +1 dBu / DI