A fully featured range of powered mixers from yamaha available with three different power ratings. Features include 4 mono microphone/line channels with One-Knob Compression, 4 stereo line channels (which can also be used as mono Mic channels), 3 Band Channel EQ, Feedback Channel Locator, channel aux and effects send , SPX Multi Effects and Stereo 7 Band Graphic EQ,. Available in the following power ratings .. EMX212S 2 x 220 watt @ 4 Ohms EMX312S 2 x 300 watt @ 4 Ohms EMX512S 2 x 500 watt @ 4 Ohms