E 12 provides six studio-quality 54 dB gain range Mic preamps with combo connectors. Two line inputs are switchable to Hi-Z input. The input section also features three stereo line inputs and a stereo return. Input channels from 1 to 4 are equipped with a single-control compressor. The six mono channels are provided with 3-band EQs, including shelving high and low bands and a semi-parametric mid-band with frequency selection and switchable Q choice, wide or narrow. The stereo input channels are provided with a three band EQ.